On Fire!

On Fire! is a debuff which causes the afflicted NPC or player to lose 8 health per second while not regenerating health. This debuff can be canceled prematurely by jumping into Water. If the player is under the effects of the Obsidian Skin Potion, lava will not burn them.

Immune NPCs

 * Meteor Head
 * Fire Imp
 * Angry Bones
 * Dark Caster
 * Cursed Skull
 * Skeletron
 * Bone Serpent
 * Undead Miner
 * Tim
 * Lava Slime
 * Hellbat
 * Demon
 * Voodoo Demon
 * Dungeon Guardian