Oubliette

The Oubliette is a secret chamber in the Gungeon, accessed through a secret trapdoor in the Keep of the Lead Lord. The Oubliette takes the appearance of a sewer-like dungeon, containing trash bags, toxic waste pits, and harmless writhing Bullet Kin.

Accessing

• The Keep of the Lead Lord always contains a room containing a Fireplace, which can be extinguished with any non-oil Goop and then interacted with to reveal a room containing the hatch to the Oubliette.
  • One (or two) water barrels can almost always be found randomly in a separate room on the same floor.
    • This water barrel can rarely spawn inside of the Oubliette entrance room, necessitating use of a goop to extinguish the fireplace.
    • The fireplace is also extinguishable Blobulin, Blobuloid, and Blobulon if it places goop close to the fireplace.
• After extinguishing the fireplace and activating it, the chance for a water barrel to spawn within the same room as the Fireplace increases dramatically for the save file.
  • The spawn chance for this water barrel appears to be independent from water barrel spawns outside of the fireplace room.
    • In some rare cases the second barrel might be in the hidden room, rendering it impossible to enter it when the first water barrel is destroyed.
• After reaching the Oubliette once, the water barrel usually spawns in the fireplace room or a room adjacent to it.
• The hidden room contains a hatch with two locks. Unlocking both locks (which takes 2 keys) opens the trapdoor, and entering the trapdoor leads to the Oubliette.
  • These locks work identically to wall locks and can be opened with Trusty Lockpicks or a Drill.
• Entering the Oubliette for the first time unlocks Trashcannon and the Grate Hall achievement.

Boss

Blobulord

Like all bosses in secret floors, there is no Master Round for beating Blobulord flawlessly.

Enemies

Icon	Name	Description
	Bullet Kin	Slowly walks towards the player, firing bullets.
	Bandana Bullet Kin	Slowly walks towards the player, rapidly firing bullets.
	Veteran Bullet Kin	Slowly walks towards the player, firing bullets and predicting the player's movements.
	Shroomer	Slowly walks towards the player, firing two bullets in a V shape.
	Mutant Bullet Kin	Slowly walks towards the player, firing bullets. Occasionally spits out a small cone of poison creep.
	Red Shotgun Kin	Slowly walks towards the player, occasionally firing a tight spread of 5 bullets. Has a chance to fire 6 bullets in all directions upon death.
	Blue Shotgun Kin	Slowly walks towards the player, occasionally firing a wide spread of 5 bullets quickly followed by a wide spread of 4 bullets. Has a chance to fire 6 bullets in all directions upon death.
	Veteran Shotgun Kin	Slowly walks towards the player, occasionally firing a V-shaped spread of 5 bullets and predicting the player's movements. Fires many bullets in all directions upon death.
	Mutant Shotgun Kin	Slowly walks towards the player, firing tight spreads of 5 bullets. Fires 6 bullets in all directions upon death.
	Sniper Shell	Periodically aims at the player with a red laser, then fires a single high-speed bullet.
	Professional	Periodically aims at the player with a green laser, then fires a single high-speed bullet that explodes into bullets in all directions upon impact.
	Hollowpoint	Floats towards the player, rapidly firing bullets. Periodically disappears and reappears elsewhere in the room.
	King Bullat	Periodically fires bouncing bullets in all directions. Spawns several Bullats and Shotgats upon death.
	Pinhead	Walks towards the player and explodes upon death. IF the player gets too close, it will leap towards the player and explode.
	Blobulon	Moves towards the player and attempts to deal contact damage. Splits into two Blobuloids upon death.
	Blobuloid	Moves towards the player and attempts to deal contact damage. Splits into two Blobulins upon death.
	Blobulin	Quickly moves towards the player and attempts to deal contact damage.
	Poisbulon	Moves towards the player, leaving a trail of poison creep. Turns into a Poisbuloid upon death.
	Poisbuloid	Moves towards the player, leaving a trail of poison creep. Splits into two Poisbulins upon death.
	Poisbulin	Quickly moves towards the player, leaving a trail of poison creep.
	Poopulon	Occasionally spins, releasing a large amount of spiraling bullets in all directions.
	Gigi	Flies towards the player, periodically spitting an egg that releases a swarm of bullets towards the player.
	Cubulon	Frequently fires bullets in all directions in a diamond shape.
	Mimic	Rapidly fires bullets towards the player. Drops items and/or pickups upon death.
	Bullat	Launches itself at the player, dying in the process.
	Shotgat	Launches two projectiles in a V shape at the player, dying in the process.
	Grenat	Launches an exploding projectile at the player, dying in the process.
	Spirat	Launches itself at the player, dying in the process. Predicts the player's movements, and can reposition itself several times before hitting walls.
	Gat	Bounces around the room and deflects bullets. Occasionally opens up to fire three spreads of four bullets towards the player.
	Gunzookie	Periodically spits up bubbles that, upon popping, fire a bullet that predicts the player's movements.
	Gunzockie	Periodically spits up four bubbles that, upon popping, fire a bullet that predicts the player's movements.
	Fungun	Periodically releases clouds of bullets. Leaves a small pool of poison creep upon death.
	Spogre	Periodically releases large clouds of bullets. Releases a smaller cloud of bullets upon death.

Notes

• A small room containing the Old Crest will always spawn within the Oubliette.

Trivia

• An oubliette is a secret dungeon with access only through a trapdoor in its ceiling, fitting with the chamber's method of access.
• It is possible to enter the trapdoor while flying. The game will freeze for a brief moment and skip straight to the loading screen of the Oubliette without a falling animation.
• Several of the decorations found here are unique to the Oubliette.
  • One decoration unique to the Oubliette is a barrel with the tip of a Bulletkin protruding from it.
    • This may be a reference to a similar prop seen in Blighttown, an infamous, similarly themed level featured in Dark Souls.
    • This is also a play on the idea of a bullet in the barrel of a gun.
• Oubliette is pronounced "oo-blee-et" /u.bliˈɛt/
• The Lost Adventurer talks about a switch behind a fireplace when interacted with at the Breach.
• You can access the Oubliette trapdoor room without dousing the fireplace by using Teleporter Prototype.

Gallery

• 

  The trapdoor to the Oubliette.

See also

• Chambers

The Gungeon
The Breach		Keep of the Lead Lord		Gungeon Proper		Black Powder Mine		Hollow		Forge
Secret Chambers
Oubliette		Abbey of the True Gun			Resourceful Rat's Lair			R&G Dept.		Bullet Hell