Duality

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Item icon
Item altar
  
  
  
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498
 
Character appearance
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Angel Room Angel Room
Devil Room Devil Room
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(page 5, column 13, row 1)
  
Duality Defeat Ultra Greedier as LilithDualityDuality
Added in Afterbirth †

Duality is an unlockable passive item added in 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 Goat Head Goat HeadCollectible Goat Head Rebirth icon.pngA Devil Room / Angel Room Door will always spawn after every boss fight, excluding the first floor and floors after Utero II/Womb II. orEucharist EucharistCollectible Eucharist icon.pngAn Angel Room door will always spawn after every boss fight, excluding the first floor and floors after Utero II/Womb II. 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 JokerPickup Joker icon.pngTeleports you to the Devil Room or Angel Room. 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]

  • One of only four items to appear in both the Angel and Devil item pools, the others being7 Seals 7 Seals7 Seals icon.pngGrants a random Harbinger familiar that changes every 10 seconds.,Lil Delirium Lil DeliriumCollectible Lil Delirium icon.pngGrants a familiar that transforms into another random familiar every 10 seconds., andVoid VoidCollectible Void icon.png6 roomsConsumes all pedestal items in the room. Active items will have their effects added to Void, and passive items will grant stat upgrades..


Lilith Unlocks Lilith Unlocks Lilith Unlocks
IncubusIncubusDefeat Hush as LilithBox of FriendsBox of FriendsDefeat Ultra Greed as LilithBig BabyBig BabyDefeat Mega Satan as LilithRune BagRune BagDefeat Isaac as LilithCambion ConceptionCambion ConceptionDefeat ??? as LilithSerpent's KissSerpent's KissDefeat Satan as LilithSuccubusSuccubusDefeat The Lamb as LilithImmaculate ConceptionImmaculate ConceptionComplete the Boss Rush as LilithGoat Head BabyGoat Head BabyDefeat Mom's Heart on hard mode as LilithDark BabyDark BabyEarn all hard mode completion marks as Lilith EuthanasiaEuthanasiaDefeat Delirium as LilithDualityDualityDefeat Ultra Greedier as Lilith
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