A Burning unit is on fire. Each combat round, they take damage that scales with their Size (since bigger units have more surface area that can feel the pain), anywhere from 1 point to half their Size rounded up. That's the roll: [1d(Size)] / 2.

Fire Attacks cause burning. The burn is applied before the Protection roll; there's a 4% chance per point, divided by 3 if it's a Fatigue attack. Fellows with 10 Fire Resistance or more, Spiritforms, and beings with a Chill Aura cannot be burned.

Note that the damage from burning is not fire damage. Those with 5 Fire Resistance or more, however, have the damage they take halved again.

The chance of a fire on a fellow's body to go out is 25% at base, +5% for each point of Cold on the Scales, +1% for each point of Fire Resistance, and +100% if it's raining or snowing. Heat is considred negative Cold, while a Fire Vulnerability is a negative Resistance.

Fire magic has several avenues for guaranteed burning, including a Burn spell. Priests of a Fire Pretender God can burn Undead fellows with Ashes to Ashes. There's also an Earth-Fire spell that chucks burning rocks at foes, which set the targets on fire after bashing them.