Binding of Isaac: Rebirth Wiki
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(added Tainted Lazarus interaction)
(Corrected my previous modification that was wrong after more tests --> in repentance, both rooms will spawn even if there's only 2 walls available (may have been changes with Repentance patches))
Tag: Source edit
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** Upon entering one, the other one will disappear.
 
** Upon entering one, the other one will disappear.
 
** Both rooms will spawn even if a devil deal was made before.
 
** Both rooms will spawn even if a devil deal was made before.
** In rooms with only two accessible walls, only one of the two will spawn.
+
** {{dlc|nr}} In rooms with only two accessible walls, only one of the two will spawn.
   
 
== Notes ==
 
== Notes ==
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** The room that was chosen this way will be the only one that opens once the boss is defeated.
 
** 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.
 
** Teleporting after choosing a door will always take you to the same room.
* {{dlc|r}} On the regular path, the item is less useful now : from {{s|Basement}} I to {{s|Depths}} I (included), there will be one wall with the entrance of the Boss Room, and another with the entrance to the alternate path ({{s|Downpour}}, {{s|Mines}} or {{s|Mausoleum}}), so there will only be 2 available walls and only one of the two rooms will spawn.
 
** On the alternate path however, both room are available to spawn in {{s|Downpour}} I, {{s|Mines}} I and {{s|Mausoleum}} I, but not in {{s|Downpour}} II, {{s|Mines}} II and {{s|Mausoleum}} II for the same reasons. Hence the item is a bit better on the alternate path.
 
 
   
 
== Synergies ==
 
== Synergies ==

Revision as of 22:33, 19 July 2021

(in Afterbirth † and Repentance)

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

Effects

  • Whenever a Devil/Angel Room spawns after defeating a boss, the other will also spawn.
    • Upon entering one, the other one will disappear.
    • Both rooms will spawn even if a devil deal was made before.
    • (except in Repentance) In rooms with only two accessible walls, only one of the two will spawn.

Notes

  • Even with Collectible Goat Head iconGoat Head or Collectible Eucharist iconEucharist 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 JokerJoker 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.

Synergies

  • Error: The given collectible ("Glowing Hour Glass") does not exist.: Time can be reversed while inside one deal to go into another.

Interactions

  • Character Tainted Lazarus iconTainted Lazarus: The Lazarus that fights the boss must be the one holding Duality in order for it to trigger.

In-game Footage

Trivia

  • Duality is one of only five items to appear in both the Angel and Devil item pools, the others being Collectible 7 Seals icon7 Seals, Collectible Lil Delirium iconLil Delirium, Collectible Void iconVoid and (in Repentance)Collectible Purgatory iconPurgatory.
  • 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.

Bugs

Bug Bug! (in Repentance) If Isaac touches a Red Chest, the game will determine whether or not he gets a Devil/Angel room that floor even if he doesn't teleport, opening only one door and nullifying Duality's effect.