Acid

Acid is a liquid material that can corrode most other materials, including steel and brickwork but not glass, dense or extremely dense rock. It is bright green in color. Like Lava, acid doesn't stain, but rather deals damage on contact. It flows downward, corroding materials in its path and releasing Flammable Gas as it evaporates.

Deals approximately 20 DPS on contact, varying with how much acid is in contact with the entity, resulting in nigh instant-death if fully surrounded by it. Aside from Ambrosia or Stainless Armour, there is nothing in the game that protects against or reduces acid damage, making it extremely dangerous to both you and your enemies.

Acid has no known set transmutations other than corrosion, but is occasionally part of the randomized 2 recipes for Alchemy.