Devil Room



Devil Rooms either contain a set of different pickups or allow Isaac to make deals with the Devil. A Devil Room has a chance to appear in a Boss Room after the boss occupying it has been defeated. If certain criteria are met, a Devil Room can be replaced by an Angel Room.

In Greed mode, Devil Rooms appear upon completing the optional 11th wave of a floor.

Possible Contents

 * 1-3 deals with the Devil
 * 3 Red Chests
 * 2 Black Hearts
 * Krampus
 * 2 deals with the Devil and 1 Devil Beggar
 * 4 deals with the Devil
 * 5 Red Chests
 * 3 Devil Beggars
 * 2 runes

Additionally, 2 Red Fire Places may spawn. Spikes may spawn instead of or in addition to any items/pickups. 1 Mom's Hand, 2 Nulls, or 1 Imp may also appear in the Devil Room. Urns may spawn in the Devil Room. 1 Mom's Dead Hand may spawn in the Devil Room.

If a Devil Room appears upon defeating Mom's Heart or It Lives, it will only contain a trapdoor to Sheol.

Deals with the Devil
A Devil Room has a high chance of spawning items that will be put up for sale. Unlike shops where Isaac pays with money, to make deals with the Devil Isaac has to trade Red Heart containers as payment. All items either cost 1 or 2 Red Heart containers and their prices roughly correspond to their power.

See the following item pool for a comprehensive list of items offered and their health price: Devil Room (Item Pool)

Angel Rooms

 * Refusing to make deals with the Devil will give Isaac the chance of an Angel Room replacing the Devil Room on subsequent floors. If any deal with the Devil is taken ( including Black Market deals), Angel Rooms will not spawn for the remainder of the run.
 * Only paying health (Red Hearts or Soul Hearts) for an item in a Devil Room or a Black Market counts as a deal with the Devil. Taking Black Hearts, opening Red Chests, and taking items that weren't paid for (such as Red Chests, Krampus, Beggars,, and ) do not count as Devil deals, allowing Isaac to still see Angel Rooms.
 * If the first offered Devil Room is not entered at all, the next offer is guaranteed to be an Angel Room.

Conditions to Make Devil Rooms Appear
A Devil Room can only open on floors between the second floor of Chapter 1 and Chapter 4.

There is only a 1% base chance for the Devil Room door to open. This chance can be modified in various ways: For example, if Isaac has avoided taking red heart damage and blown up a dead shopkeeper, he will have (1+35+99+10)% = 145% base deal with the devil chance which will be displayed as 100% chance, and will go down to 36.25% once he sees the devil room.

Trivia

 * In the original The Binding of Isaac, the Devil Rooms were somewhat less forgiving; if Isaac has an Eternal Heart, taking a Devil Deal will remove it.
 * Furthermore, if Isaac has at least one Soul Heart and one Red Heart container, and he takes a Devil deal, Isaac would die. Isaac's last will will show a or a  as a result.
 * Purchasing something worth two Red Heart containers with one Red Heart container and at least one Soul Heart will also remove all the Soul Hearts. Strangely, this will not kill Isaac, but the next damage he takes will, similarly to.