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Duality is an unlockable passive item added in Afterbirth †.
- 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.
- Even with
Goat Head
A Devil Room / Angel Room Door will always spawn after every boss fight, excluding the first floor and floors after Utero II/Womb II. or 
Eucharist
An 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.
- This applies even if teleported to the devil room (for example, through a red chest); only the devil room will open when the boss is defeated.
The Binding of Isaac: Rebirth 
Achievements
Attributes
Bosses
Cards and Runes
Challenges
Chapters
Characters
Co-op
Items
Item Pools
Monsters
Objects
Pickups
Pills
Rooms
Seeds
Transformations
Trinkets
