Rat Poison is an active item in Fiend Folio, a mod for The Binding of Isaac.

If used in a modded room whose author is known, all contents in the room will be instantly removed, including enemies, grid entities, pickups, etc.

The effect will be repeated in every single room made by the same author during the run, indicated by clouds appearing inside the room along with a sound effect.

The room's name and author (if available) can be checked using the debug 5 console command.

Has no effect if used inside a room with an author that's not known, and the item will not be consumed. This is generally the case for rooms from the default game.

If used in a room created by the developer Vermin, the corpse of a large green rodent will fall from the ceiling.

Rat Poison can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Rat Poison 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 Fiend Folio from the Steam Workshop.