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Undefined item
Undefined is an unlockable active item in The Binding of Isaac.
Description
Teleports Isaac to the Treasure Room, Secret Room, Super Secret Room or the I AM ERROR room.
The chance to teleport to each room is equal.
There is a very small chance to teleport into a Black Market.
Has no effect when used in the Home level.
Note
This page shows information as of the latest Repentance release.
To see latest up-to date information about this item for the new Repentance+ (Online Co-op) DLC, check this page instead.
How to unlock?
Complete Boss Rush as Eden.
Item pools
Undefined can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| offensive | Can appear for  Tainted Lost. |
Special synergies
The following special synergies and interactions for Undefined have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues | Spawns blue glitched wisps in the middle ring that fire tears with the  Playdough Cookie effects. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
Samson's Chains 
Mongo Baby 
Isaac's Tears 
Scissors 
Breath of Life 
The Polaroid