Crystal Key

 

"Call to the other side"

Trinket ID
5.350.170

Unlock Method
Defeat Mother as Tainted Lost

Crystal Key is a trinket added in The Binding of Isaac: Repentance.

Effects

• Whenever Isaac clears a room, has a chance to unlock a neighboring Red Room.
  • This effect can occur while Isaac is inside a Red Room.

Notes

The chance for a Red Room door to unlock depends on the number of Crystal Keys held and what room was cleared.

Crystal Key Count	Normal Room	Red room
1	33.3%	12.5%
2	50%	16.6%
3	100%	25%
4	100%	50%
5	100%	100%

• Each cleared wave of a Challenge Room has a chance to generate an adjacent Red Room.

In-game footage

Keys

Items:

• Dad's Key
• Key Piece 1
• Key Piece 2
• Mom's Key
• Red Key
• Sharp Key

Trinkets:

• Blue Key
• Crystal Key
• Gilded Key
• Rusted Key
• Store Key
• Strange Key