Burning Damage
Some like it hot, however most folks don't enjoy burning to death. All kinds of things can catch a creature on fire, for instance torches, chemicals, doctored-up weapons, or magic spells. When your body, hair, clothes, or equipment catch fire, you begin taking Continual Damage (4 HP per round). Every round you remain aflame, the fire spreads and increases the damage per round by 2.
Next comes the business of extinguishing oneself. Creatures who are partially aflame (i.e. taking 6 or less Continual Damage per round) can pour water over the affected area or cover it with heavy cloth and pat out the fire (which takes 3 AP). A creature who is completely engulfed in fire (i.e. taking 7 or more) must drop to the ground and roll around or leap into a body of water (Which takes 6 AP).