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Removed in RepentanceItem icon
Added in RepentanceItem icon
Item altar
"You feel very balanced"
Table dividing line 1.png
Item ID
Character Appearance
Character appearance
Table dividing line 2.png
Table dividing line 3.png
Collection Grid
Removed in Repentance(page 5, column 13, row 1)
Added in Repentance(page 5, column 14, row 1)
Unlock Method
Duality Defeat Ultra Greedier as Lilith
Added in Afterbirth †

Duality is an unlockable passive item added in The Binding of Isaac: Afterbirth †.

Effects[edit | edit source]

  • Whenever a Devil/Angel Room spawns after defeating a boss, the other will also spawn.
    • Upon entering one, the other one will disappear.
    • In rooms with only two accessible walls, only one of the two will spawn.

Notes[edit | edit source]

  • Even with 15►Goat Head Goat Head or 15►Eucharist Eucharist both rooms will not stay open, and entering either of the rooms will make the other disappear.
  • If Duality was bought through a Devil deal, it is still possible to get Angel Rooms as well as Devil Rooms.
  • Teleportation via a Joker Joker card, a Red Chest or a Sacrifice Room before defeating the boss and choosing a door will follow the normal rules of Devil/Angel Room generation, instead of a 50/50 chance.
    • The room that was chosen this way will be the only one that opens once the boss is defeated.
    • Teleporting after choosing a door will always take you to the same room.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • Duality is one of only four items to appear in both the Angel and Devil item pools, the others being 15►7 Seals 7 Seals, 15►Lil Delirium Lil Delirium, and 15►Void Void.
  • The Duality image appears to be similar in concept to the yin and yang symbol of Ancient Chinese philosophy, as the latter represents the concept of dualism as well. However, they don't quite appear to be exact in terms of the diameter format.
Bug Bug! Added in Repentance In the optional chapters, Duality seems to only open one door.

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