Chests

Chests are objects that can contain pickups, items, guns, and more. Chests are always found in treasure rooms, but can also be found upon completing a room, using certain shrines, completing one of Winchester's games, or in secret rooms.

Chests can be found locked or unlocked; locked chests need a key to be unlocked, while unlocked chests can be opened for free. Chests found in treasure rooms are always locked, and always contain an item or gun, unless replaced with a Rat Note.

On every floor, one treasure room chest will contain a gun while the other will contain an item. This does not affect drops from destroyed chests, meaning a chest that would normally have an item can drop a gun when destroyed.

Upon entering a room with a chest, there is a random chance that a fuse will appear by the chest. If the chest is not opened within a short period of time, it will explode, leaving behind nothing. Any item or weapon that can spray a liquid (except for oil) can douse the fuse and stop it from exploding.

Mimics

Chests can rarely be replaced by Mimics. This chance increases with each point of curse the player gets, and all coloured chests (not including rainbow, synergy and rat chests) will be replaced by Mimics if the player is holding Mimic Tooth Necklace.

Quality

The order of chest rarity and quality of items inside from most common to least common is:

1. Brown
2. Blue
3. Green
4. Red
5. Black
6. Rainbow

All chests can contain various pickups in addition to an item or gun.

Specifically, Blue ( ) chests have a high chance of dropping items, over any other type of collectible.

Quality Frequency

Each floor has different chances for different chest qualities, with chances for higher quality chests increasing on later floors. This does not account for magnificence.

There are two different loot tables within the game, the Original loot table (which was the loot table before the Advanced Gungeons & Draguns update) and the Gungeons and Draguns loot table. These can be switched between in The Breach or title screen in the Gameplay menu of the Options menu.

Gungeons and Draguns

Floor
1	35%	32%	20%	9%	4%
2/Oub	10%	37%	40%	9%	4%
3/Abbey	2%	26%	54%	12.5%	5.5%
4	2%	20%	50%	20%	8%
5	0%	10%	42.5%	35%	12.5%

Classic

Floor
1	42.5%	35%	15%	5%	2.5%
2/Oub	20%	32.5%	35%	9%	3.5%
3/Abbey	10%	22%	50%	12.5%	5.5%
4	2%	20%	50%	20%	8%
5	0%	10%	42.5%	35%	12.5%

Chest Destruction

Chests can be destroyed by shooting them. This will often cause them to drop inferior loot, such as pickups, items or Junk. They may instead explode, damaging the player if they are too close.

Destruction Tables

Payout	Weight	Notes
Junk	0.45	Has a 20% chance to be replaced by Ser Junkan if he has not already been unlocked. Weight is multiplied by 3 if the player has at least one Key. Weight is also multiplied by 1.5 if the player has Ser Junkan.
Half Heart	0.2	N/A
An Explosion	0.1	N/A
Gold Junk (If Unlocked)	0.005	Weight is multiplied by 3 if the player has Ser Junkan.
Ser Junkan (If Unlocked)	0.05	N/A
Random D Tier Item or Gun	0.25	The quality of dropped items is improved if the player has Book of Chest Anatomy.

Calculation

The way broken chests calculate which payout to give is as follows;

(GoldJunkWeight + ItemWeight + HalfHeartWeight + ExplosionWeight + JunkWeight + JunkanWeight) x (A random decimal value between 0 and 1)

All valid payouts (Gold Junk for example will not be valid if it is not unlocked, and it's weight will be 0) have their weights added together, and multiplied by a random decimal between 0 and 1.
Then, the game proceeds to check if that random value is less than the Gold Junk Weight, if so then the payout will be Gold Junk. If not, it checks if the payout is less than Gold Junk Weight + Random Item Weight, and if so it will drop a Random Item.
It checks like this for each value until eventually settling on an Explosion if nothing else is valid.

• Synergy Chests
• Rat Chests
• Rainbow Chests
• Truth Chest
• Revival Chests
• Glitch Chests

Synergy Chests

Synergy chests are special chests added in the Advanced Gungeons & Draguns Update. Upon opening them, they will either turn red or blue and drop a random item or gun with random quality.

• If blue, they will drop an item or gun that completes a synergy.
• If red, they will drop an item or gun but with an unlikely chance of a synergy.

After freeing Synergrace, Synergy chests will appear randomly in the place of regular chests past the first chamber, and will always have a fuse. They have a roughly 5% chance to replace a normal chest, and one is guaranteed to spawn after defeating Old King. They can also be purchased from Synergrace.

Synergy chests cannot be mimics, even if the player is holding the Mimic Tooth Necklace. Synergy chests can, however, be glitched or rainbow.

Rat Chests

Rat chests are special chests in the Resourceful Rat's Lair that can only be opened using keys dropped by the Resourceful Rat during the Punch-Out phase of his fight. Four rat chests always appear in the loot room after the fight, containing Elimentaler, Partially-Eaten Cheese, Resourceful Sack, and Rat Boots. Collecting all four items transforms the player character into the Resourceful Rat (changes the skin of the character while the 4 items are held).

It is possible for rat chests to be mimics, though not by holding the Mimic Tooth Necklace, which has no effect, other than bringing out a local mimic union member NPC to warn you that there are simply too many chests in the room and they couldn't agree to that deal.

Rat Chests cannot be opened with AKEY-47 or Shelleton Key, but they can be opened with Trusty Lockpicks and Drill.

If the Resourceful Rat is killed with one player dead in co-op, all the chests can be opened without the use of a key. This does not revive the other player.

If any of the four Rat items are obtained previous to defeating the Rat, opening any of the Rat chests will give an A tier item or gun.

Rainbow Chests

Rainbow chests have a 0.0333% chance to replace a regular chest. Chests found upon clearing a room have a 0.001% chance to become a rainbow chest in addition to the normal 0.0333% chance. Rainbow chests also have a chance to disguise themselves as brown chests, only revealing themselves once opened, broken, or shot with a weapon that leaves water/goop.

Rainbow chests are never locked. However, they can be locked when they appear as a brown chest.

Rainbow chests contain 8 items and/or guns, which consist of approximately 15% , 54% and 31% . They can also transform into synergy chests upon being opened, containing 8 items and/or guns that synergize with items/weapons currently held, similar to an actual synergy chest.

During a Rainbow Run, a rainbow chest appears at the beginning of every chamber, and can contain items of all qualities. However, only one item or gun can be obtained from said chest, the others disappearing after the first is picked up. If a rainbow chest is found organically during a Rainbow Run, players will be able to obtain all eight items.

Brother Albern's Truth Chest

Brother Albern's Truth Chest is a special chest that can be found in secret rooms alongside Brother Albern himself. By answering one of Albern's questions, which cannot be answered incorrectly, he will permit you to open the Truth Chest, which contains one to two random pickups, guns or items of random quality. The chest can be destroyed to receive Lies.

The Truth Chest can also be forcibly opened with the AKEY-47, and either destroying it or opening it with the AKEY-47 will cause Albern to exclaim "Betrayal! It can't be true!" before disappearing.

This chest is guaranteed to appear at least once in the Abbey of the True Gun, as there is a guaranteed secret room there that contains Brother Albern.

Revival Chests

Revival chests appear during co-op when a player dies replacing all unopened chests. If it is opened, the dead player will pop out of it, and other chests in the chamber will revert to normal. Keys are not required to open these chests.

It is recommended to check the chest's quality by looking at the map so that the players don't lose better grade chests for reviving, but instead using lower grade ones to do so.

Glitch Chests

Fight screen of the glitch boss after opening the chest and entering the boss room.

Glitch chests have a 0.1% chance to appear, and they can only appear in the Keep of the Lead Lord, Gungeon Proper, and Black Powder Mine after the Beholster has been killed at least once and the player has entered the Gungeon more than 10 times.

Opening a glitched chest instantly takes the player to a glitched version of the next floor that contains nothing but a boss room with two glitched Beholsters. Defeating the bosses rewards the player with normal boss rewards in addition to 7 guns or items and numerous pickups.

Notes

• Getting killed by any enemy during the glitched boss fight will result in the death screen showing glitched text in place of the name of what killed you.
• Before the Advanced Gungeons and Draguns update, holding the Mimic Tooth Necklace would turn a glitch chest into a green chest Mimic and render it impossible to reach the glitched floor.
• If playing co-op and one of the players is dead, the glitch chest will bring the dead player back to life and send the players to the glitched floor.
• The Tinker can still appear in the elevator shaft on glitched floors.
• All of the pedestals dropped after the fight will hold guns unless the player either throws an empty gun and picks it back up or acquires a new gun on the current floor before the bosses are killed (for example by using Lament Configurum).
• If the player has Mimic Tooth Necklace, upon defeating the bosses, all 8 item pedestals will be mimics.
• Using Drill on a glitched chest has the same effect as opening it normally.
• A rainbow chest in a Rainbow Run can be glitched, with no visual distinction from a normal chest.
• If a glitched chest is opened during a Rainbow Run, Bowler will still take all 7 guns/items from the reward pedestals.
• If a glitched chest is opened in Bullet Hell through modding, the player will be sent to a odd version of the Breach with Gungeon Proper textures, and the music of the Breach will play. Other than that, it is the normal glitch floor.
• If a glitched chest is teleported to the next chamber with Chest Teleporter, it will remain glitched.

Union Mimic Chest

See: Union Mimic Chest

Gallery

• 

  A brown chest.

• 

  A blue chest.

• 

  A green chest.

• 

  A red chest.

• 

  A black chest.

• 

  A rainbow chest.

• 

  Brother Albern's Truth Chest.

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  A green glitch chest.

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  A synergy chest.

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  A rat chest.

• 

  A synergy chest spawned from opening a rainbow chest before it detonated, giving eight synergizing items.

• 

  A rainbow chest that was disguised as a brown chest after opening.

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  Union Mimic Chest