- Spawns a familiar that fires a thin beam. It needs to be charged up; it will not fire if Isaac is shooting a steady stream of tears.
- The beam deals 3.5 damage per tick and can strike an enemy up to 9 times, for a total of 31.5 damage.
- Unlike Brimstone, Lil Brimstone can start charging up a beam while still firing the previous one.
Found in
- Devil Room
- Treasure Room