Devil's Crown is an unlockable trinket in The Binding of Isaac, added in the Repentance DLC.

Replaces Treasure Rooms with special Red Treasure Rooms that contain items from the Devil Room item pool. Items inside must be payed for with heart containers, just like a regular Devil Deal.

The trinket will immediately convert Treasure Rooms if they haven't been previously visited. The same goes vice-versa, dropping the trinket will convert the room back to a normal one.

Does not affect the Silver Treasure Rooms in Greed Mode.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this trinket for the previous Repentance version, check this page instead.

Defeat Mother as Azazel.

Devil's Crown can be found in the following item pools:

The following special synergies and interactions for Devil's Crown have been documented.

* Note that not all possible synergies and interactions are listed here.

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.

Devil's Crown

• Treasure rooms become Devil Deals
• Golden Trinket (without Mom's Box): 25% chance for the room to be a number magnet variant
• Mom's Box: 25% chance for the room to be a number magnet variant
• Mom's Box + Golden Trinket: 33% chance for the room to be a number magnet variant

• Check out the trinket description on the external Isaac Wiki.