Soul of Fiend is an unlockable consumable in Fiend Folio, a mod for The Binding of Isaac.

Spawns 4-7 Hollow Minions that disappear when the room is cleared.

Spawns 0-2 Black Heart Minions that convert into Black Hearts when the room is cleared.

There is a 30% chance to spawn 1 Black Heart Minion, 20% to spawn 2, and 50% to not spawn any.

Defeat Boss Rush and Hush as Tainted Fiend.

The following special synergies and interactions for Soul of Fiend have been documented.

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

The following sounds are related to this consumable.

• Check out the consumable description on the mod's external Wiki.
• Download Fiend Folio from the Steam Workshop.