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Knife Piece 1 item
Knife Piece 1 is a familiar in The Binding of Isaac, added in the Repentance DLC.
Description
Can be acquired from the Treasure Room in the Mirrored World in Downpour/Dross II.
Spawns a knife handle familiar that follows Isaac.
Makes a special room generate in the Mines/Ashpit II that contains Knife Piece 2, the second piece of the knife.
When combined with the other piece, it forms a knife familiar that launches itself in the direction Isaac is shooting, dealing 25 damage to and piercing enemies it hits.
Can be launched at the red door at the end of Mausoleum/Gehenna to open the door leading to the Mother path, destroying the knife in the process.
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.
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| uniquefamiliar | Cannot be duplicated via  Box of Friends. |
| lazarusshared | Passive effects are shared between  Tainted Lazarus' forms. |
| noeden | Unavailable as starting items for  Eden and  Tainted Eden. |
| quest | Quest item. |
Special synergies
The following special synergies and interactions for Knife Piece 1 have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | BFFS! | ×2 damage for the full knife. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
Sharp Key 
Booster Pack 
Mega Mush 
Knife Piece 2 
Death Certificate 
Bot Fly