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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 the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, 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.
Internal item description
Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.
Undefined
• Teleports Isaac to the treasure room, secret room, super secret room, or error room
• Abyss: x1 dashing locust .75x Isaac's damage
• Book of Virtues: x1 middle wisp - 2 hp - 3 damage
• Book of Virtues: Playdough Cookie tears
Sounds
The following sounds are related to this item.
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