We Need to Go Deeper!

Effects

Spawns a trapdoor that leads to the next floor upon activation.
- There is a 10% chance the trapdoor will lead into a Crawl Space or a Black Market.
- If used in (Womb) Womb II/(Utero) Utero II/(Scarred Womb) Scarred Womb II, the trapdoor will always lead to (Sheol) Sheol.

If more than one crawl space trapdoor exists, they will all lead to the same Crawl Space.
(Removed in Repentance) Has no effect in the (Cathedral) Cathedral, (Chest) Chest, (Sheol) Sheol, (Dark Room) Dark Room, (Added in Afterbirth)(???) ??? and (Added in Afterbirth †)(The Void) The Void (no trapdoors of any type will be generated).
- (Added in Repentance) Can only create crawl space trapdoors in the forementioned stages and in (Corpse) Corpse II, (Home) Home and during the Ascent.
A trapdoor cannot be placed in front of a Secret Room entrance position, making this item an indirect aid to locating Secret Rooms.
This item can be used to destroy rocks if used while Isaac is flying over a rock.
This item can be used to create a trapdoor to (Sheol) Sheol on (Womb) Womb, even before Sheol has been unlocked.
When used on the last floor of a challenge, a trapdoor to the next floor can spawn. If it is entered, Isaac must beat the boss of that floor to spawn the ending trophy.
(Added in Afterbirth †) The item may be used on the dirt patches in the (Dark Room) Dark Room to dig up a random type of chest.

(Added in Repentance) Book of Virtues: Spawns a skull wisp on the middle ring that shoots bone tears.