Sulfur

Sulfur is an activated item added in The Binding of Isaac: Repentance.

Effects[]

Upon activation, Isaac is turned into a demon and gains the effects of Brimstone for the current room.
- If Sulfur has already been used in the current room, it instead gives Isaac a 1.2x damage multiplier, +1 damage, and increases the size of the laser for the current room.
  - Further uses of Sulfur will increase Isaac's damage by 1.
This item belongs to the Leviathan set. Collecting three items from this set will transform Isaac into Leviathan.

Sulfur functions identically to Brimstone. For a full list of interactions, see that page.
Sulfur is extremely powerful in Greed Mode, as you can stay in the enemy wave room and continuously use Sulfur to stack your damage boosts. This works even better with Rock Bottom.

Book of Virtues: Spawns red wisps in the middle ring that fire a short Brimstone laser beam similar to Azazel, but significantly smaller.
Brimstone/Car Battery: Activates twice to give an additional damage bonus and wider laser.

Sulfur is from the Antibirth mod. Originally in Antibirth, due to a bug, using Sulfur twice in one room would permanently grant Brimstone to Isaac instead of giving him a more powerful brimstone laser.
- This item originated in the "Binding of Isaac: Community Remix" mod for the original Binding of Isaac game.
"Sulfur" and "Brimstone" were once synonyms but the word "brimstone" has fallen out of use (outside of biblical usage).
Sulfur's appearance is based on the alchemical symbol for sulfur, although the triangle is upside-down and it lacks a small piece separating the cross from the triangle.
This item has the same pickup quote as The Nail.