Key Master (Afterbirth+ Item Pool)

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Item Pool
Removed in Afterbirth Rebirth Treasure Room Shop Library Curse Room Boss Secret Room Devil Room Angel Room Golden Chest Red Chest Beggar Devil Beggar Key Master
Added in Afterbirth Afterbirth Treasure Room Shop Library Curse Room Boss Secret Room Devil Room Angel Room Golden Chest Red Chest Beggar Devil Beggar Key Master Bomb Bum
Added in Afterbirth Greed Mode Treasure Room Shop Library Curse Room Boss Secret Room Devil Room Angel Room Golden Chest
Added in Afterbirth † Afterbirth † Treasure Room Shop Library Curse Room Boss Secret Room Devil Room Angel Room Golden Chest Red Chest Beggar Devil Beggar Key Master Bomb Bum
Added in Afterbirth † Greed Mode Treasure Room Shop Library Curse Room Boss Secret Room Devil Room Angel Room Golden Chest

Key master.png
Key Masters will either pay out with one of these items or the Paper Clip Paper ClipPaper Clip Icon.pngGolden Chests can be opened without using a key. after being given enough keys.

Activated Collectibles[edit | edit source]

Name ID Icon Quote Description
Dad's Key 175
Dad's Key
2 rooms
Opens all doors... Opens all doors in the current room when activated, including doors which require a key to open and entrances to secret rooms. Opens the big doors in the first room of both The Chest and the Dark Room.

Passive Collectibles[edit | edit source]

Name ID Icon Quote Description
???'s Only Friend 320 ???'s Only Friend Controlled friend Summons a big attack fly that can be controlled with the shooting direction-keys.
BBF 272 BBF Big Beautiful Fly Spawns a familiar that flies around the room in a manner similar to the Boom Fly and explodes on contact with an enemy. Respawns after ten seconds.
Distant Admiration 57 Distant Admiration Attack fly A red attack fly circles further out than the Halo of Flies / Pretty Flies, but closer than Forever Alone. Deals more damage than Forever Alone.
Forever Alone 128 Forever Alone Attack fly Spawns a blue attack fly that orbits a long distance from Isaac.
Added in Afterbirth Friend Zone 364 Friend Zone Friendly fly A white orbiting fly which deals 3 contact damage per tick to enemies. This familiar orbits Isaac at a middle length distance somewhere between Distant Admiration and Forever Alone.
Halo of Flies 10 Halo of Flies Projectile protection Spawns two pretty fly familiars that block enemy shots and deal contact damage to enemies.
Added in Afterbirth Key Bum 388 Key Bum He wants your keys! Spawns a portable key master that follows Isaac and collects keys, giving random chests in return.
Added in Afterbirth Lost Fly 365 Lost Fly Lost protector A familiar fly that moves in a straight line and attaches itself to the first obstacle or wall it comes into contact with in each room. If any enemies walk into its path, it will deal 7 contact damage per tick. If the obstacle it is attached to is destroyed then it will continue rolling in the direction it was previously travelling until it meets another wall or obstacle.
Mom's Key 199 Mom's Key Less is now more +2 keys Spawns 2 keys. Generates additional pickups from chests.
Smart Fly 264 Smart Fly Revenge fly After Isaac takes damage, this fly will deal continuous touch damage to whatever enemy caused the damage until it is dead. The fly will then systematically attack 1 enemy at a time until the room is cleared.


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