Mausoleum

Mausoleum is a new environment added in Antibirth. It contains many necrotic-themed and psychic-themed enemies, as well as teleporters that can connect different parts of the same room or two different rooms. The Mausoleum is almost always segmented into two main areas. The primary area, where Isaac enters, contains a standard set of rooms along with a special teleporter room. The teleporter room requires Isaac to expend resources or maneuver through obstacles to reach a teleporter, which transports Isaac to the secondary area. The secondary area contains a few rewards, along with additional random special rooms.

Treasure rooms in the Mausoleum always have two items to choose from.

After "A Secret Exit" is unlocked, a locked door to the Mausoleum will appear upon completing The Depths, Necropolis, or Mines. The locked door requires two soul hearts, immortal hearts, or black hearts to enter. The door will always take soul hearts before it takes black hearts, and black hearts before it takes immortal hearts. If playing as Bethany, the door will instead take 4 charges from her counter, and if playing as The Lost, it is free to enter.

Monsters[ | ]

Monster	Description
Scab	Flies towards Isaac. Upon death, farts and sends out 6 blood shots in all directions.
Mullighoul	Runs away from Isaac, occasionally spawning a Willo. Spawns a Willo upon death.
Polty	Appears out of a random bucket, then picks up and throws obstacles at Isaac. If the room has no usable obstacles, it will leave the room. If there are any Tinted Rocks in the room, it will wait until they are the last remaining obstacle, then attempt to flee with one of them.
Bishop	Stationary enemy that protects any nearby enemies from damage.
Black Knight	Moves erratically around the room and charges toward Isaac when in line of sight. Can only be damaged from behind. Tears that hit its front are reflected and can damage Isaac.
Big Bony	Slowly walks towards Isaac. Occasionally fires a large bone which creates rock waves near its point of impact.
Candler	Bounces around the room diagonally. Occasionally pauses and creates a small fire underneath itself.
Corpse Eater	Rapidly moves around the room erratically and charges at Isaac if he comes within its line of sight.
Carrion Rider	Rapidly moves around the room erratically and charges at Isaac if he comes within its line of sight. The Bony on its back shoots at Isaac.
Cursed Globin	Chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into two piles of goo, which can be killed. Both piles can regenerate after a short period of time if not killed quickly.
Loose Knight	Moves erratically around the room and can only be damaged from behind. Splits into an Empty Knight and a Pon upon death.
Empty Knight	Moves erratically around the room and charges toward Isaac when in line of sight. Cannot be damaged, but will die if the corresponding Pon is killed.
Pon	Hops around the room, leaving pools of damaging red creep.
Exorcist	Summons ghost enemies such as Wizoobs, Lil' Haunts, and Candlers.
Whipper	Moves around the room and charges at Isaac if he gets within its line of sight. If Isaac gets close, it lashes out with a short-ranged whip, which can damage Isaac and deflect projectiles.
Lunatic	Moves around the room and charges at Isaac if he gets within its line of sight. Constantly lashes out with its whip.
Snapper	Moves around the room and charges at Isaac if he gets within its line of sight. If Isaac lines up with it horizontally or vertically, it lashes out with a long-range whip which can damage Isaac.
Necromancer	Summons skeleton enemies such as Bonies and Big Bonies.
Nightwatch	Invulnerable enemies. Moves in a fixed pattern or rotates in a spot. If Isaac enters its light, it will lock all doors, summon enemies, and vanish.
Revenant	Moves erratically. If Isaac gets near, it becomes stationary and starts breathing a stream of purple fire at Isaac.
Screamer	Walks slowly around the room. If Isaac gets too close, it will scream, paralyzing Isaac. It will gain a slowing aura and start charging towards him.
Smoky	Bounces around the room with a purple aura. If Isaac touches an aura, he will briefly become afraid, unable to fire tears. Dies when the room is cleared.
Strifer	Walks horizontally or vertically, attempting to line up with Isaac. Frequently fires lines of four tears forwards.
Swapper	Slowly floats towards Isaac and fires purple lasers. Occasionally teleports and reappears elsewhere. Has a chance to swap positions with Isaac.
Vis Versa	Charges and fires a curving Brimstone laser when Isaac gets in its line of sight.
Quake Grimace	Periodically fires a rock wave forwards. Does not stop, even if the room is cleared.

Mini-Bosses
Larry Jr. Monstro Widow Gurdy

Rebirth Monsters[ | ]

Bosses[ | ]

Floor 1[]


The Heretic	The Visage	The Siren	The Pile

Floor 2[]

Mausoleum Mom

Knife Piece[ | ]

Mausoleum II contains Knife Piece 3, one of three pieces necessary to enter the Corpse.

Somewhere in the primary area of the floor, there will be a room containing many fireplaces. In the secondary area of the floor, there will be a room containing active and inactive teleporters in the same formation as the fireplaces. To acquire Knife Piece 3, put out the fires in the fireplace room that correspond with the inactive teleporters.

Try to not take Abel or Lil' Dumpy, as these familiars might put out fires that should stay active.

Notes[ | ]

When the heart boss fight inside the flesh room is defeated, all pickups and trinkets on the current Mausoleum floor will disappear.

Bugs[ | ]

Bug! The teleporter to the secondary area or back may teleport Isaac to a random room near the designated area when the curse of the maze is active.

Bug! If the player has all three knife pieces and defeats Mausoleum Mom, there is a chance that the door leading to the Mom's Heart fight might be a door that can only be opened by a bomb instead of the knife. When entered, the room will only have a passage to the Corpse and no heart boss fight.

Bug! If a Devil Room door appears on the same wall as the Mausoleum door in a double-sized Boss Room, entering and exiting the Devil Room may cause its door to take the Mausoleum door's place. Upon exiting and re-entering the Boss Room, the Mausoleum door will be open.

Bug! When the Mausoleum door appears, quitting and re-entering in the game will cause the door to be unable to be open.