diff --git a/squirrelbattle/display/statsdisplay.py b/squirrelbattle/display/statsdisplay.py
index 120d284..35ff92c 100644
--- a/squirrelbattle/display/statsdisplay.py
+++ b/squirrelbattle/display/statsdisplay.py
@@ -33,7 +33,8 @@ class StatsDisplay(Display):
                   f"INT {self.player.intelligence}\n" \
                   f"CHR {self.player.charisma}\n" \
                   f"DEX {self.player.dexterity}\n" \
-                  f"CON {self.player.constitution}"
+                  f"CON {self.player.constitution}\n" \
+                  f"CRI {self.player.critical}%"
         self.addstr(self.pad, 3, 0, string3)
 
         inventory_str = _("Inventory:") + " "
@@ -49,13 +50,31 @@ class StatsDisplay(Display):
             if count > 1:
                 inventory_str += f"x{count} "
             printed_items.append(item)
-        self.addstr(self.pad, 8, 0, inventory_str)
+        self.addstr(self.pad, 9, 0, inventory_str)
 
-        self.addstr(self.pad, 9, 0, f"{self.pack.HAZELNUT} "
-                                    f"x{self.player.hazel}")
+        if self.player.equipped_main:
+            self.addstr(self.pad, 10, 0,
+                        _("Equipped main:") + " "
+                        f"{self.pack[self.player.equipped_main.name.upper()]}")
+        if self.player.equipped_secondary:
+            self.addstr(self.pad, 11, 0,
+                        _("Equipped secondary:") + " "
+                        + self.pack[self.player.equipped_secondary
+                                    .name.upper()])
+        if self.player.equipped_armor:
+            self.addstr(self.pad, 12, 0,
+                        _("Equipped chestplate:") + " "
+                        + self.pack[self.player.equipped_armor.name.upper()])
+        if self.player.equipped_helmet:
+            self.addstr(self.pad, 13, 0,
+                        _("Equipped helmet:") + " "
+                        + self.pack[self.player.equipped_helmet.name.upper()])
+
+        self.addstr(self.pad, 14, 0, f"{self.pack.HAZELNUT} "
+                                     f"x{self.player.hazel}")
 
         if self.player.dead:
-            self.addstr(self.pad, 11, 0, _("YOU ARE DEAD"), curses.COLOR_RED,
+            self.addstr(self.pad, 15, 0, _("YOU ARE DEAD"), curses.COLOR_RED,
                         bold=True, blink=True, standout=True)
 
     def display(self) -> None:
diff --git a/squirrelbattle/display/texturepack.py b/squirrelbattle/display/texturepack.py
index dae0763..9ad513d 100644
--- a/squirrelbattle/display/texturepack.py
+++ b/squirrelbattle/display/texturepack.py
@@ -35,6 +35,12 @@ class TexturePack:
     TIGER: str
     TRUMPET: str
     WALL: str
+    EAGLE: str
+    SHIELD: str
+    CHESTPLATE: str
+    HELMET: str
+    RING_OF_MORE_EXPERIENCE: str
+    RING_OF_CRITICAL_DAMAGE: str
 
     ASCII_PACK: "TexturePack"
     SQUIRREL_PACK: "TexturePack"
@@ -66,7 +72,7 @@ TexturePack.ASCII_PACK = TexturePack(
     entity_bg_color=curses.COLOR_BLACK,
 
     BODY_SNATCH_POTION='S',
-    BOMB='o',
+    BOMB='ç',
     EMPTY=' ',
     EXPLOSION='%',
     FLOOR='.',
@@ -77,12 +83,18 @@ TexturePack.ASCII_PACK = TexturePack(
     MERCHANT='M',
     PLAYER='@',
     RABBIT='Y',
+    SHIELD='D',
     SUNFLOWER='I',
     SWORD='\u2020',
     TEDDY_BEAR='8',
     TIGER='n',
     TRUMPET='/',
     WALL='#',
+    EAGLE='µ',
+    CHESTPLATE='(',
+    HELMET='0',
+    RING_OF_MORE_EXPERIENCE='o',
+    RING_OF_CRITICAL_DAMAGE='o',
 )
 
 TexturePack.SQUIRREL_PACK = TexturePack(
@@ -107,10 +119,16 @@ TexturePack.SQUIRREL_PACK = TexturePack(
     PLAYER='🐿️ ️',
     MERCHANT='🦜',
     RABBIT='🐇',
+    SHIELD='🛡️ ',
     SUNFLOWER='🌻',
     SWORD='🗡️ ',
     TEDDY_BEAR='🧸',
     TIGER='🐅',
     TRUMPET='🎺',
     WALL='🧱',
+    EAGLE='🦅',
+    CHESTPLATE='🦺',
+    HELMET='⛑️',
+    RING_OF_MORE_EXPERIENCE='💍',
+    RING_OF_CRITICAL_DAMAGE='💍',
 )
diff --git a/squirrelbattle/entities/items.py b/squirrelbattle/entities/items.py
index 0661d5d..874cf45 100644
--- a/squirrelbattle/entities/items.py
+++ b/squirrelbattle/entities/items.py
@@ -4,7 +4,6 @@
 from random import choice, randint
 from typing import Optional
 
-from .player import Player
 from ..interfaces import Entity, FightingEntity, Map, InventoryHolder
 from ..translations import gettext as _
 
@@ -30,7 +29,7 @@ class Item(Entity):
         The item is dropped from the inventory onto the floor.
         """
         if self.held:
-            self.held_by.inventory.remove(self)
+            self.held_by.remove_from_inventory(self)
             self.held_by.map.add_entity(self)
             self.move(self.held_by.y, self.held_by.x)
             self.held = False
@@ -45,15 +44,27 @@ class Item(Entity):
         """
         Indicates what should be done when the item is equipped.
         """
+        # Other objects are only equipped as secondary.
+        if self.held_by.equipped_secondary:
+            self.held_by.equipped_secondary.unequip()
+        self.held_by.remove_from_inventory(self)
+        self.held_by.equipped_secondary = self
 
-    def hold(self, player: InventoryHolder) -> None:
+    def unequip(self) -> None:
+        """
+        Indicates what should be done when the item is unequipped.
+        """
+        self.held_by.remove_from_inventory(self)
+        self.held_by.add_to_inventory(self)
+
+    def hold(self, holder: InventoryHolder) -> None:
         """
         The item is taken from the floor and put into the inventory.
         """
         self.held = True
-        self.held_by = player
+        self.held_by = holder
         self.held_by.map.remove_entity(self)
-        player.add_to_inventory(self)
+        holder.add_to_inventory(self)
 
     def save_state(self) -> dict:
         """
@@ -68,7 +79,8 @@ class Item(Entity):
         """
         Returns the list of all item classes.
         """
-        return [BodySnatchPotion, Bomb, Heart, Sword]
+        return [BodySnatchPotion, Bomb, Heart, Shield, Sword,
+                Chestplate, Helmet, RingCritical, RingXP]
 
     def be_sold(self, buyer: InventoryHolder, seller: InventoryHolder) -> bool:
         """
@@ -120,7 +132,7 @@ class Bomb(Item):
     """
     damage: int = 5
     exploding: bool
-    owner: Optional["Player"]
+    owner: Optional["InventoryHolder"]
     tick: int
 
     def __init__(self, name: str = "bomb", damage: int = 5,
@@ -193,7 +205,6 @@ class Explosion(Item):
         """
         The player can't hold an explosion.
         """
-        pass
 
 
 class Weapon(Item):
@@ -214,14 +225,99 @@ class Weapon(Item):
         d["damage"] = self.damage
         return d
 
+    def equip(self) -> None:
+        """
+        When a weapon is equipped, the player gains strength.
+        """
+        self.held_by.remove_from_inventory(self)
+        self.held_by.equipped_main = self
+        self.held_by.strength += self.damage
+
+    def unequip(self) -> None:
+        """
+        Remove the strength earned by the weapon.
+        :return:
+        """
+        super().unequip()
+        self.held_by.strength -= self.damage
+
 
 class Sword(Weapon):
     """
     A basic weapon
     """
-    def __init__(self, name: str = "sword", price: int = 20, *args, **kwargs):
+    def __init__(self, name: str = "sword", price: int = 20,
+                 *args, **kwargs):
         super().__init__(name=name, price=price, *args, **kwargs)
-        self.name = name
+
+
+class Armor(Item):
+    """
+    Class of items that increase the player's constitution.
+    """
+    constitution: int
+
+    def __init__(self, constitution: int, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.constitution = constitution
+
+    def equip(self) -> None:
+        super().equip()
+        self.held_by.constitution += self.constitution
+
+    def unequip(self) -> None:
+        super().unequip()
+        self.held_by.constitution -= self.constitution
+
+    def save_state(self) -> dict:
+        d = super().save_state()
+        d["constitution"] = self.constitution
+        return d
+
+
+class Shield(Armor):
+    """
+    Class of shield items, they can be equipped in the other hand.
+    """
+
+    def __init__(self, name: str = "shield", constitution: int = 2,
+                 price: int = 6, *args, **kwargs):
+        super().__init__(name=name, constitution=constitution, price=price,
+                         *args, **kwargs)
+
+
+class Helmet(Armor):
+    """
+    Class of helmet items, they can be equipped on the head.
+    """
+
+    def __init__(self, name: str = "helmet", constitution: int = 2,
+                 price: int = 8, *args, **kwargs):
+        super().__init__(name=name, constitution=constitution, price=price,
+                         *args, **kwargs)
+
+    def equip(self) -> None:
+        if self.held_by.equipped_helmet:
+            self.held_by.equipped_helmet.unequip()
+        self.held_by.remove_from_inventory(self)
+        self.held_by.equipped_helmet = self
+
+
+class Chestplate(Armor):
+    """
+    Class of chestplate items, they can be equipped on the body.
+    """
+
+    def __init__(self, name: str = "chestplate", constitution: int = 4,
+                 price: int = 15, *args, **kwargs):
+        super().__init__(name=name, constitution=constitution, price=price,
+                         *args, **kwargs)
+
+    def equip(self) -> None:
+        if self.held_by.equipped_armor:
+            self.held_by.equipped_armor.unequip()
+        self.held_by.remove_from_inventory(self)
+        self.held_by.equipped_armor = self
 
 
 class BodySnatchPotion(Item):
@@ -256,3 +352,79 @@ class BodySnatchPotion(Item):
         self.held_by.recalculate_paths()
 
         self.held_by.inventory.remove(self)
+
+
+class Ring(Item):
+    """
+    A class of rings that boost the player's statistics.
+    """
+    maxhealth: int
+    strength: int
+    intelligence: int
+    charisma: int
+    dexterity: int
+    constitution: int
+    critical: int
+    experience: float
+
+    def __init__(self, maxhealth: int = 0, strength: int = 0,
+                 intelligence: int = 0, charisma: int = 0,
+                 dexterity: int = 0, constitution: int = 0,
+                 critical: int = 0, experience: float = 0, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.maxhealth = maxhealth
+        self.strength = strength
+        self.intelligence = intelligence
+        self.charisma = charisma
+        self.dexterity = dexterity
+        self.constitution = constitution
+        self.critical = critical
+        self.experience = experience
+
+    def equip(self) -> None:
+        super().equip()
+        self.held_by.maxhealth += self.maxhealth
+        self.held_by.strength += self.strength
+        self.held_by.intelligence += self.intelligence
+        self.held_by.charisma += self.charisma
+        self.held_by.dexterity += self.dexterity
+        self.held_by.constitution += self.constitution
+        self.held_by.critical += self.critical
+        self.held_by.xp_buff += self.experience
+
+    def unequip(self) -> None:
+        super().unequip()
+        self.held_by.maxhealth -= self.maxhealth
+        self.held_by.strength -= self.strength
+        self.held_by.intelligence -= self.intelligence
+        self.held_by.charisma -= self.charisma
+        self.held_by.dexterity -= self.dexterity
+        self.held_by.constitution -= self.constitution
+        self.held_by.critical -= self.critical
+        self.held_by.xp_buff -= self.experience
+
+    def save_state(self) -> dict:
+        d = super().save_state()
+        d["maxhealth"] = self.maxhealth
+        d["strength"] = self.strength
+        d["intelligence"] = self.intelligence
+        d["charisma"] = self.charisma
+        d["dexterity"] = self.dexterity
+        d["constitution"] = self.constitution
+        d["critical"] = self.critical
+        d["experience"] = self.experience
+        return d
+
+
+class RingCritical(Ring):
+    def __init__(self, name: str = "ring_of_critical_damage", price: int = 15,
+                 critical: int = 20, *args, **kwargs):
+        super().__init__(name=name, price=price, critical=critical,
+                         *args, **kwargs)
+
+
+class RingXP(Ring):
+    def __init__(self, name: str = "ring_of_more_experience", price: int = 25,
+                 experience: float = 2, *args, **kwargs):
+        super().__init__(name=name, price=price, experience=experience,
+                         *args, **kwargs)
diff --git a/squirrelbattle/entities/monsters.py b/squirrelbattle/entities/monsters.py
index 27c96a6..e22aa51 100644
--- a/squirrelbattle/entities/monsters.py
+++ b/squirrelbattle/entities/monsters.py
@@ -94,9 +94,11 @@ class Rabbit(Monster):
     A rabbit monster.
     """
     def __init__(self, name: str = "rabbit", strength: int = 1,
-                 maxhealth: int = 15, *args, **kwargs) -> None:
+                 maxhealth: int = 15, critical: int = 30,
+                 *args, **kwargs) -> None:
         super().__init__(name=name, strength=strength,
-                         maxhealth=maxhealth, *args, **kwargs)
+                         maxhealth=maxhealth, critical=critical,
+                         *args, **kwargs)
 
 
 class TeddyBear(Monster):
@@ -107,3 +109,13 @@ class TeddyBear(Monster):
                  maxhealth: int = 50, *args, **kwargs) -> None:
         super().__init__(name=name, strength=strength,
                          maxhealth=maxhealth, *args, **kwargs)
+
+
+class GiantSeaEagle(Monster):
+    """
+    An eagle boss
+    """
+    def __init__(self, name: str = "eagle", strength: int = 1000,
+                 maxhealth: int = 5000, *args, **kwargs) -> None:
+        super().__init__(name=name, strength=strength,
+                         maxhealth=maxhealth, *args, **kwargs)
diff --git a/squirrelbattle/entities/player.py b/squirrelbattle/entities/player.py
index 6f84cc6..615dfd5 100644
--- a/squirrelbattle/entities/player.py
+++ b/squirrelbattle/entities/player.py
@@ -2,7 +2,9 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from random import randint
+from typing import Dict, Optional, Tuple
 
+from .items import Item
 from ..interfaces import FightingEntity, InventoryHolder
 
 
@@ -12,22 +14,40 @@ class Player(InventoryHolder, FightingEntity):
     """
     current_xp: int = 0
     max_xp: int = 10
+    xp_buff: float = 1
+    paths: Dict[Tuple[int, int], Tuple[int, int]]
+    equipped_main: Optional[Item]
+    equipped_secondary: Optional[Item]
+    equipped_helmet: Optional[Item]
+    equipped_armor: Optional[Item]
 
     def __init__(self, name: str = "player", maxhealth: int = 20,
                  strength: int = 5, intelligence: int = 1, charisma: int = 1,
                  dexterity: int = 1, constitution: int = 1, level: int = 1,
                  current_xp: int = 0, max_xp: int = 10, inventory: list = None,
-                 hazel: int = 42, vision: int = 5, *args, **kwargs) \
-            -> None:
+                 hazel: int = 42, equipped_main: Optional[Item] = None,
+                 equipped_armor: Optional[Item] = None, critical: int = 5,
+                 equipped_secondary: Optional[Item] = None,
+                 equipped_helmet: Optional[Item] = None, xp_buff: float = 1,
+                 vision: int = 5, *args, **kwargs) -> None:
         super().__init__(name=name, maxhealth=maxhealth, strength=strength,
                          intelligence=intelligence, charisma=charisma,
                          dexterity=dexterity, constitution=constitution,
-                         level=level, *args, **kwargs)
+                         level=level, critical=critical, *args, **kwargs)
         self.current_xp = current_xp
         self.max_xp = max_xp
+        self.xp_buff = xp_buff
         self.inventory = self.translate_inventory(inventory or [])
         self.paths = dict()
         self.hazel = hazel
+        self.equipped_main = self.dict_to_item(equipped_main) \
+            if isinstance(equipped_main, dict) else equipped_main
+        self.equipped_armor = self.dict_to_item(equipped_armor) \
+            if isinstance(equipped_armor, dict) else equipped_armor
+        self.equipped_secondary = self.dict_to_item(equipped_secondary) \
+            if isinstance(equipped_secondary, dict) else equipped_secondary
+        self.equipped_helmet = self.dict_to_item(equipped_helmet) \
+            if isinstance(equipped_helmet, dict) else equipped_helmet
         self.vision = vision
 
     def move(self, y: int, x: int) -> None:
@@ -60,9 +80,24 @@ class Player(InventoryHolder, FightingEntity):
         Adds some experience to the player.
         If the required amount is reached, the player levels up.
         """
-        self.current_xp += xp
+        self.current_xp += int(xp * self.xp_buff)
         self.level_up()
 
+    def remove_from_inventory(self, obj: Item) -> None:
+        """
+        Remove the given item from the inventory, even if the item is equipped.
+        """
+        if obj == self.equipped_main:
+            self.equipped_main = None
+        elif obj == self.equipped_armor:
+            self.equipped_armor = None
+        elif obj == self.equipped_secondary:
+            self.equipped_secondary = None
+        elif obj == self.equipped_helmet:
+            self.equipped_helmet = None
+        else:
+            return super().remove_from_inventory(obj)
+
     # noinspection PyTypeChecker,PyUnresolvedReferences
     def check_move(self, y: int, x: int, move_if_possible: bool = False) \
             -> bool:
@@ -92,4 +127,12 @@ class Player(InventoryHolder, FightingEntity):
         d = super().save_state()
         d["current_xp"] = self.current_xp
         d["max_xp"] = self.max_xp
+        d["equipped_main"] = self.equipped_main.save_state()\
+            if self.equipped_main else None
+        d["equipped_armor"] = self.equipped_armor.save_state()\
+            if self.equipped_armor else None
+        d["equipped_secondary"] = self.equipped_secondary.save_state()\
+            if self.equipped_secondary else None
+        d["equipped_helmet"] = self.equipped_helmet.save_state()\
+            if self.equipped_helmet else None
         return d
diff --git a/squirrelbattle/game.py b/squirrelbattle/game.py
index 779e98f..ecdfccb 100644
--- a/squirrelbattle/game.py
+++ b/squirrelbattle/game.py
@@ -131,7 +131,7 @@ class Game:
             self.state = GameMode.MAINMENU
         self.display_actions(DisplayActions.REFRESH)
 
-    def handle_key_pressed_play(self, key: KeyValues) -> None:
+    def handle_key_pressed_play(self, key: KeyValues) -> None:  # noqa: C901
         """
         In play mode, arrows or zqsd move the main character.
         """
@@ -149,6 +149,12 @@ class Game:
                 self.map.tick(self.player)
         elif key == KeyValues.INVENTORY:
             self.state = GameMode.INVENTORY
+            self.display_actions(DisplayActions.UPDATE)
+        elif key == KeyValues.USE and self.player.equipped_main:
+            if self.player.equipped_main:
+                self.player.equipped_main.use()
+            if self.player.equipped_secondary:
+                self.player.equipped_secondary.use()
         elif key == KeyValues.SPACE:
             self.state = GameMode.MAINMENU
         elif key == KeyValues.CHAT:
diff --git a/squirrelbattle/interfaces.py b/squirrelbattle/interfaces.py
index 601229b..ff47fda 100644
--- a/squirrelbattle/interfaces.py
+++ b/squirrelbattle/interfaces.py
@@ -3,7 +3,7 @@
 
 from enum import Enum, auto
 from math import ceil, sqrt
-from random import choice, randint
+from random import choice, choices, randint
 from typing import List, Optional, Any, Dict, Tuple
 from queue import PriorityQueue
 from functools import reduce
@@ -188,7 +188,8 @@ class Map:
                 tile = self.tiles[y][x]
                 if tile.can_walk():
                     break
-            entity = choice(Entity.get_all_entity_classes())()
+            entity = choices(Entity.get_all_entity_classes(),
+                             weights=Entity.get_weights(), k=1)[0]()
             entity.move(y, x)
             self.add_entity(entity)
 
@@ -602,11 +603,19 @@ class Entity:
         """
         from squirrelbattle.entities.items import BodySnatchPotion, Bomb, Heart
         from squirrelbattle.entities.monsters import Tiger, Hedgehog, \
-            Rabbit, TeddyBear
-        from squirrelbattle.entities.friendly import Merchant, Sunflower, \
-            Trumpet
+            Rabbit, TeddyBear, GiantSeaEagle
+        from squirrelbattle.entities.friendly import Merchant, Sunflower
         return [BodySnatchPotion, Bomb, Heart, Hedgehog, Rabbit, TeddyBear,
-                Sunflower, Tiger, Merchant, Trumpet]
+                Sunflower, Tiger, Merchant, GiantSeaEagle]
+
+    @staticmethod
+    def get_weights() -> list:
+        """
+        Returns a weigth list associated to the above function, to
+        be used to spawn random entities with a certain probability.
+        """
+        return [3, 5, 6, 5, 5, 5,
+                5, 4, 4, 1]
 
     @staticmethod
     def get_all_entity_classes_in_a_dict() -> dict:
@@ -615,11 +624,11 @@ class Entity:
         """
         from squirrelbattle.entities.player import Player
         from squirrelbattle.entities.monsters import Tiger, Hedgehog, Rabbit, \
-            TeddyBear
+            TeddyBear, GiantSeaEagle
         from squirrelbattle.entities.friendly import Merchant, Sunflower, \
             Trumpet
         from squirrelbattle.entities.items import BodySnatchPotion, Bomb, \
-            Heart, Sword
+            Heart, Sword, Shield, Chestplate, Helmet, RingCritical, RingXP
         return {
             "Tiger": Tiger,
             "Bomb": Bomb,
@@ -633,6 +642,12 @@ class Entity:
             "Sunflower": Sunflower,
             "Sword": Sword,
             "Trumpet": Trumpet,
+            "Eagle": GiantSeaEagle,
+            "Shield": Shield,
+            "Chestplate": Chestplate,
+            "Helmet": Helmet,
+            "RingCritical": RingCritical,
+            "RingXP": RingXP,
         }
 
     def save_state(self) -> dict:
@@ -659,11 +674,12 @@ class FightingEntity(Entity):
     dexterity: int
     constitution: int
     level: int
+    critical: int
 
     def __init__(self, maxhealth: int = 0, health: Optional[int] = None,
                  strength: int = 0, intelligence: int = 0, charisma: int = 0,
                  dexterity: int = 0, constitution: int = 0, level: int = 0,
-                 *args, **kwargs) -> None:
+                 critical: int = 0, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
         self.maxhealth = maxhealth
         self.health = maxhealth if health is None else health
@@ -673,6 +689,7 @@ class FightingEntity(Entity):
         self.dexterity = dexterity
         self.constitution = constitution
         self.level = level
+        self.critical = critical
 
     @property
     def dead(self) -> bool:
@@ -686,21 +703,28 @@ class FightingEntity(Entity):
         The entity deals damage to the opponent
         based on their respective stats.
         """
+        diceroll = randint(1, 100)
+        damage = self.strength
+        string = " "
+        if diceroll <= self.critical:  # It is a critical hit
+            damage *= 4
+            string = " " + _("It's a critical hit!") + " "
         return _("{name} hits {opponent}.")\
             .format(name=_(self.translated_name.capitalize()),
-                    opponent=_(opponent.translated_name)) + " " + \
-            opponent.take_damage(self, self.strength)
+                    opponent=_(opponent.translated_name)) + string + \
+            opponent.take_damage(self, damage)
 
     def take_damage(self, attacker: "Entity", amount: int) -> str:
         """
         The entity takes damage from the attacker
         based on their respective stats.
         """
-        self.health -= amount
+        damage = max(0, amount - self.constitution)
+        self.health -= damage
         if self.health <= 0:
             self.die()
-        return _("{name} takes {amount} damage.")\
-            .format(name=self.translated_name.capitalize(), amount=str(amount))\
+        return _("{name} takes {damage} damage.")\
+            .format(name=self.translated_name.capitalize(), damage=str(damage))\
             + (" " + _("{name} dies.")
                .format(name=self.translated_name.capitalize())
                if self.health <= 0 else "")
@@ -757,10 +781,10 @@ class InventoryHolder(Entity):
         """
         for i in range(len(inventory)):
             if isinstance(inventory[i], dict):
-                inventory[i] = self.dict_to_inventory(inventory[i])
+                inventory[i] = self.dict_to_item(inventory[i])
         return inventory
 
-    def dict_to_inventory(self, item_dict: dict) -> Entity:
+    def dict_to_item(self, item_dict: dict) -> Entity:
         """
         Translates a dictionnary that contains the state of an item
         into an item object.
@@ -783,13 +807,15 @@ class InventoryHolder(Entity):
         """
         Adds an object to the inventory.
         """
-        self.inventory.append(obj)
+        if obj not in self.inventory:
+            self.inventory.append(obj)
 
     def remove_from_inventory(self, obj: Any) -> None:
         """
         Removes an object from the inventory.
         """
-        self.inventory.remove(obj)
+        if obj in self.inventory:
+            self.inventory.remove(obj)
 
     def change_hazel_balance(self, hz: int) -> None:
         """
diff --git a/squirrelbattle/locale/de/LC_MESSAGES/squirrelbattle.po b/squirrelbattle/locale/de/LC_MESSAGES/squirrelbattle.po
index 56d4540..20aa2a7 100644
--- a/squirrelbattle/locale/de/LC_MESSAGES/squirrelbattle.po
+++ b/squirrelbattle/locale/de/LC_MESSAGES/squirrelbattle.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: squirrelbattle 3.14.1\n"
 "Report-Msgid-Bugs-To: squirrel-battle@crans.org\n"
-"POT-Creation-Date: 2021-01-06 15:19+0100\n"
+"POT-Creation-Date: 2021-01-08 01:57+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -17,6 +17,10 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
+#, python-brace-format
+msgid "{name} takes {amount} damage."
+msgstr "{name} nimmt {amount} Schadenspunkte."
+
 #: squirrelbattle/display/menudisplay.py:160
 msgid "INVENTORY"
 msgstr "BESTAND"
@@ -25,11 +29,32 @@ msgstr "BESTAND"
 msgid "STALL"
 msgstr "STAND"
 
-#: squirrelbattle/display/statsdisplay.py:36
+#: squirrelbattle/display/statsdisplay.py:23
+#: squirrelbattle/tests/translations_test.py:60
+msgid "player"
+msgstr "Spieler"
+
+#: squirrelbattle/display/statsdisplay.py:35
 msgid "Inventory:"
 msgstr "Bestand:"
 
-#: squirrelbattle/display/statsdisplay.py:55
+#: squirrelbattle/display/statsdisplay.py:52
+msgid "Equipped main:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:56
+msgid "Equipped secondary:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:61
+msgid "Equipped chestplate:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:65
+msgid "Equipped helmet:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:72
 msgid "YOU ARE DEAD"
 msgstr "SIE WURDEN GESTORBEN"
 
@@ -49,11 +74,11 @@ msgstr "Die Sonne ist warm heute"
 #. The bomb is exploding.
 #. Each entity that is close to the bomb takes damages.
 #. The player earn XP if the entity was killed.
-#: squirrelbattle/entities/items.py:151
+#: squirrelbattle/entities/items.py:163
 msgid "Bomb is exploding."
 msgstr "Die Bombe explodiert."
 
-#: squirrelbattle/entities/items.py:248
+#: squirrelbattle/entities/items.py:344
 #, python-brace-format
 msgid "{player} exchanged its body with {entity}."
 msgstr "{player} täuscht seinem Körper mit {entity} aus."
@@ -96,6 +121,10 @@ msgstr ""
 "Die JSON-Datei ist nicht korrekt.\n"
 "Ihre Speicherung scheint korrumpiert. Sie wurde gelöscht."
 
+#: squirrelbattle/interfaces.py:452
+msgid "It's a critical hit!"
+msgstr ""
+
 #: squirrelbattle/interfaces.py:453
 #, python-brace-format
 msgid "{name} hits {opponent}."
@@ -103,8 +132,8 @@ msgstr "{name} schlägt {opponent}."
 
 #: squirrelbattle/interfaces.py:465
 #, python-brace-format
-msgid "{name} takes {amount} damage."
-msgstr "{name} nimmt {amount} Schadenspunkte."
+msgid "{name} takes {damage} damage."
+msgstr ""
 
 #: squirrelbattle/interfaces.py:467
 #, python-brace-format
@@ -218,10 +247,6 @@ msgstr "Textur-Packung"
 msgid "Language"
 msgstr "Sprache"
 
-#: squirrelbattle/tests/translations_test.py:62
-msgid "player"
-msgstr "Spieler"
-
 #: squirrelbattle/tests/translations_test.py:64
 msgid "hedgehog"
 msgstr "Igel"
diff --git a/squirrelbattle/locale/es/LC_MESSAGES/squirrelbattle.po b/squirrelbattle/locale/es/LC_MESSAGES/squirrelbattle.po
index f85e681..0bfdac6 100644
--- a/squirrelbattle/locale/es/LC_MESSAGES/squirrelbattle.po
+++ b/squirrelbattle/locale/es/LC_MESSAGES/squirrelbattle.po
@@ -17,6 +17,10 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
+#, python-brace-format
+msgid "{name} takes {amount} damage."
+msgstr "{name} recibe {amount} daño."
+
 #: squirrelbattle/display/menudisplay.py:160
 msgid "INVENTORY"
 msgstr "INVENTORIO"
@@ -25,11 +29,32 @@ msgstr "INVENTORIO"
 msgid "STALL"
 msgstr "PUESTO"
 
-#: squirrelbattle/display/statsdisplay.py:36
+#: squirrelbattle/display/statsdisplay.py:23
+#: squirrelbattle/tests/translations_test.py:60
+msgid "player"
+msgstr "jugador"
+
+#: squirrelbattle/display/statsdisplay.py:35
 msgid "Inventory:"
 msgstr "Inventorio :"
 
-#: squirrelbattle/display/statsdisplay.py:55
+#: squirrelbattle/display/statsdisplay.py:52
+msgid "Equipped main:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:56
+msgid "Equipped secondary:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:61
+msgid "Equipped chestplate:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:65
+msgid "Equipped helmet:"
+msgstr ""
+
+#: squirrelbattle/display/statsdisplay.py:72
 msgid "YOU ARE DEAD"
 msgstr "ERES MUERTO"
 
@@ -48,11 +73,11 @@ msgstr "El sol está caliente hoy"
 #. The bomb is exploding.
 #. Each entity that is close to the bomb takes damages.
 #. The player earn XP if the entity was killed.
-#: squirrelbattle/entities/items.py:151
+#: squirrelbattle/entities/items.py:163
 msgid "Bomb is exploding."
 msgstr "La bomba está explotando."
 
-#: squirrelbattle/entities/items.py:248
+#: squirrelbattle/entities/items.py:344
 #, python-brace-format
 msgid "{player} exchanged its body with {entity}."
 msgstr "{player} intercambió su cuerpo con {entity}."
@@ -95,6 +120,10 @@ msgstr ""
 "El JSON archivo no es correcto.\n"
 "Su guarda parece corrupta. Fue eliminada."
 
+#: squirrelbattle/interfaces.py:452
+msgid "It's a critical hit!"
+msgstr ""
+
 #: squirrelbattle/interfaces.py:453
 #, python-brace-format
 msgid "{name} hits {opponent}."
@@ -102,8 +131,8 @@ msgstr "{name} golpea a {opponent}."
 
 #: squirrelbattle/interfaces.py:465
 #, python-brace-format
-msgid "{name} takes {amount} damage."
-msgstr "{name} recibe {amount} daño."
+msgid "{name} takes {damage} damage."
+msgstr ""
 
 #: squirrelbattle/interfaces.py:467
 #, python-brace-format
@@ -217,10 +246,6 @@ msgstr "Paquete de texturas"
 msgid "Language"
 msgstr "Languaje"
 
-#: squirrelbattle/tests/translations_test.py:62
-msgid "player"
-msgstr "jugador"
-
 #: squirrelbattle/tests/translations_test.py:64
 msgid "hedgehog"
 msgstr "erizo"
diff --git a/squirrelbattle/locale/fr/LC_MESSAGES/squirrelbattle.po b/squirrelbattle/locale/fr/LC_MESSAGES/squirrelbattle.po
index 81a4ab3..42172c3 100644
--- a/squirrelbattle/locale/fr/LC_MESSAGES/squirrelbattle.po
+++ b/squirrelbattle/locale/fr/LC_MESSAGES/squirrelbattle.po
@@ -17,6 +17,10 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
+#, python-brace-format
+msgid "{name} takes {amount} damage."
+msgstr "{name} prend {amount} points de dégât."
+
 #: squirrelbattle/display/menudisplay.py:160
 msgid "INVENTORY"
 msgstr "INVENTAIRE"
@@ -25,11 +29,32 @@ msgstr "INVENTAIRE"
 msgid "STALL"
 msgstr "STAND"
 
-#: squirrelbattle/display/statsdisplay.py:36
+#: squirrelbattle/display/statsdisplay.py:23
+#: squirrelbattle/tests/translations_test.py:60
+msgid "player"
+msgstr "joueur"
+
+#: squirrelbattle/display/statsdisplay.py:35
 msgid "Inventory:"
 msgstr "Inventaire :"
 
-#: squirrelbattle/display/statsdisplay.py:55
+#: squirrelbattle/display/statsdisplay.py:52
+msgid "Equipped main:"
+msgstr "Équipement principal :"
+
+#: squirrelbattle/display/statsdisplay.py:56
+msgid "Equipped secondary:"
+msgstr "Équipement secondaire :"
+
+#: squirrelbattle/display/statsdisplay.py:61
+msgid "Equipped chestplate:"
+msgstr "Plastron équipé :"
+
+#: squirrelbattle/display/statsdisplay.py:65
+msgid "Equipped helmet:"
+msgstr "Casque équipé :"
+
+#: squirrelbattle/display/statsdisplay.py:72
 msgid "YOU ARE DEAD"
 msgstr "VOUS ÊTES MORT"
 
@@ -49,11 +74,11 @@ msgstr "Le soleil est chaud aujourd'hui"
 #. The bomb is exploding.
 #. Each entity that is close to the bomb takes damages.
 #. The player earn XP if the entity was killed.
-#: squirrelbattle/entities/items.py:151
+#: squirrelbattle/entities/items.py:163
 msgid "Bomb is exploding."
 msgstr "La bombe explose."
 
-#: squirrelbattle/entities/items.py:248
+#: squirrelbattle/entities/items.py:344
 #, python-brace-format
 msgid "{player} exchanged its body with {entity}."
 msgstr "{player} a échangé son corps avec {entity}."
@@ -96,6 +121,10 @@ msgstr ""
 "Le fichier JSON de sauvegarde est incorrect.\n"
 "Votre sauvegarde semble corrompue. Elle a été supprimée."
 
+#: squirrelbattle/interfaces.py:452
+msgid "It's a critical hit!"
+msgstr "C'est un coup critique !"
+
 #: squirrelbattle/interfaces.py:453
 #, python-brace-format
 msgid "{name} hits {opponent}."
@@ -103,8 +132,8 @@ msgstr "{name} frappe {opponent}."
 
 #: squirrelbattle/interfaces.py:465
 #, python-brace-format
-msgid "{name} takes {amount} damage."
-msgstr "{name} prend {amount} points de dégât."
+msgid "{name} takes {damage} damage."
+msgstr "{name} prend {damage} dégâts."
 
 #: squirrelbattle/interfaces.py:467
 #, python-brace-format
@@ -218,10 +247,6 @@ msgstr "Pack de textures"
 msgid "Language"
 msgstr "Langue"
 
-#: squirrelbattle/tests/translations_test.py:62
-msgid "player"
-msgstr "joueur"
-
 #: squirrelbattle/tests/translations_test.py:64
 msgid "hedgehog"
 msgstr "hérisson"
@@ -256,7 +281,7 @@ msgstr "bombe"
 
 #: squirrelbattle/tests/translations_test.py:73
 msgid "explosion"
-msgstr ""
+msgstr "explosion"
 
 #: squirrelbattle/tests/translations_test.py:74
 msgid "heart"
diff --git a/squirrelbattle/tests/entities_test.py b/squirrelbattle/tests/entities_test.py
index 028aebc..af6f7dd 100644
--- a/squirrelbattle/tests/entities_test.py
+++ b/squirrelbattle/tests/entities_test.py
@@ -19,6 +19,7 @@ class TestEntities(unittest.TestCase):
         """
         self.map = Map.load(ResourceManager.get_asset_path("example_map.txt"))
         self.player = Player()
+        self.player.constitution = 0
         self.map.add_entity(self.player)
         self.player.move(self.map.start_y, self.map.start_x)
 
@@ -55,6 +56,7 @@ class TestEntities(unittest.TestCase):
         self.assertTrue(entity.dead)
 
         entity = Rabbit()
+        entity.critical = 0
         self.map.add_entity(entity)
         entity.move(15, 44)
         # Move randomly
@@ -76,6 +78,7 @@ class TestEntities(unittest.TestCase):
 {self.player.name.capitalize()} takes {entity.strength} damage.")
 
         # Fight the rabbit
+        self.player.critical = 0
         old_health = entity.health
         self.player.move_down()
         self.assertEqual(entity.health, old_health - self.player.strength)
diff --git a/squirrelbattle/tests/game_test.py b/squirrelbattle/tests/game_test.py
index efc20da..0843ae8 100644
--- a/squirrelbattle/tests/game_test.py
+++ b/squirrelbattle/tests/game_test.py
@@ -2,13 +2,16 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import os
+import random
 import unittest
 
 from ..bootstrap import Bootstrap
 from ..display.display import Display
 from ..display.display_manager import DisplayManager
 from ..entities.friendly import Merchant, Sunflower
-from ..entities.items import Bomb, Heart, Sword, Explosion
+from ..entities.items import Bomb, Heart, Sword, Explosion, Shield, Helmet, \
+    Chestplate, RingCritical
+from ..entities.monsters import GiantSeaEagle
 from ..entities.player import Player
 from ..enums import DisplayActions
 from ..game import Game, KeyValues, GameMode
@@ -613,6 +616,100 @@ class TestGame(unittest.TestCase):
         self.game.handle_key_pressed(KeyValues.SPACE)
         self.assertEqual(self.game.state, GameMode.PLAY)
 
+    def test_equipment(self) -> None:
+        """
+        Ensure that equipment is working.
+        """
+        self.game.state = GameMode.INVENTORY
+
+        # sword goes into the main equipment slot
+        sword = Sword()
+        sword.hold(self.game.player)
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.equipped_main, sword)
+        self.assertFalse(self.game.player.inventory)
+
+        # shield goes into the secondary equipment slot
+        shield = Shield()
+        shield.hold(self.game.player)
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.equipped_secondary, shield)
+        self.assertFalse(self.game.player.inventory)
+
+        # helmet goes into the helmet slot
+        helmet = Helmet()
+        helmet.hold(self.game.player)
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.equipped_helmet, helmet)
+        self.assertFalse(self.game.player.inventory)
+
+        # helmet goes into the armor slot
+        chestplate = Chestplate()
+        chestplate.hold(self.game.player)
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.equipped_armor, chestplate)
+        self.assertFalse(self.game.player.inventory)
+
+        # Use bomb
+        bomb = Bomb()
+        bomb.hold(self.game.player)
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.equipped_secondary, bomb)
+        self.assertIn(shield, self.game.player.inventory)
+        self.game.state = GameMode.PLAY
+        self.game.handle_key_pressed(KeyValues.USE)
+        self.assertIsNone(self.game.player.equipped_secondary)
+        self.game.state = GameMode.INVENTORY
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.equipped_secondary, shield)
+        self.assertFalse(self.game.player.inventory)
+
+        # Reequip, which is useless but covers code
+        sword.equip()
+        shield.equip()
+        helmet.equip()
+        chestplate.equip()
+        self.game.save_state()
+
+        # Unequip all
+        sword.unequip()
+        shield.unequip()
+        helmet.unequip()
+        chestplate.unequip()
+        self.assertIsNone(self.game.player.equipped_main)
+        self.assertIsNone(self.game.player.equipped_secondary)
+        self.assertIsNone(self.game.player.equipped_helmet)
+        self.assertIsNone(self.game.player.equipped_armor)
+        self.assertIn(sword, self.game.player.inventory)
+        self.assertIn(shield, self.game.player.inventory)
+        self.assertIn(helmet, self.game.player.inventory)
+        self.assertIn(chestplate, self.game.player.inventory)
+
+        # Test rings
+        self.game.player.inventory.clear()
+        ring = RingCritical()
+        ring.hold(self.game.player)
+        old_critical = self.game.player.critical
+        self.game.handle_key_pressed(KeyValues.EQUIP)
+        self.assertEqual(self.game.player.critical,
+                         old_critical + ring.critical)
+        self.game.save_state()
+        ring.unequip()
+
+    def test_critical_hit(self) -> None:
+        """
+        Ensure that critical hits are working.
+        """
+        random.seed(2)  # Next random.randint(1, 100) will output 8
+        self.game.player.critical = 10
+        sea_eagle = GiantSeaEagle()
+        self.game.map.add_entity(sea_eagle)
+        sea_eagle.move(2, 6)
+        old_health = sea_eagle.health
+        self.game.player.hit(sea_eagle)
+        self.assertEqual(sea_eagle.health,
+                         old_health - self.game.player.strength * 4)
+
     def test_ladders(self) -> None:
         """
         Ensure that the player can climb on ladders.