Back Door is a passive item in Reverie, a mod for The Binding of Isaac.

Spawns a door familiar behind Isaac that blocks projectiles. It deals 7 contact damage per tick (52.5 per second).

Back Door can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Back Door have been documented.

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

• Check out the item description on the mod's external Wiki.
• Download Reverie from the Steam Workshop.