Troll Bombs in the Binding of Isaac: Rebirth (BOIR)

Troll Bombs are types of bombs in The Binding of Isaac: Rebirth (TBOIR)

There is a 10% chance a Troll Bomb would appear in the room instead of a regular bomb

Troll bombs cannot be picked up or destroyed. They explode a few seconds after appearing, costing the player one hitpoint

Troll bombs can also be dropped by certain monsters and bosses, such as Pride