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Key Piece 1 item
Key Piece 1 is an unlockable familiar in The Binding of Isaac.
Description
+25% chance to spawn an Angel Room instead of a Devil Room when defeating the floor's boss.
Grants a +2.5% chance to convert Red Heart pickups into 
Eternal Hearts.
Unlocks the door to the Mega Satan fight in The Chest or Dark Room when combined with Key Piece 2.
Spawns when defeating Uriel if not already in possession.
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 Chapter 6.
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| uniquefamiliar | Cannot be duplicated via  Box of Friends. |
| offensive | Can appear for  Tainted Lost. |
| lazarusshared | Passive effects are shared between  Tainted Lazarus' forms. |
| noeden | Unavailable as starting items for  Eden and  Tainted Eden. |
| nocantrip | Not available as card effects during the Cantripped! challenge. |
| quest | Quest item. |
External links
- Check out the item description on the external Isaac Wiki.
Infestation 2 
E. Coli 
Death's Touch 
Key Piece 2 
Experimental Treatment 
Contract from Below