Flask of Combustion

When used to make a successful missile attack (slid as weapon on the combat board), this alchemical weapon deals Fire damage to the monster. It is usable only once, whether the attack succeeds or misses.

Like all alchemical weapons, this item deals double damage if the attacker scores a “natural 20” on its attack slide and is affected by Ranged combat bonuses (hit and damage). But unlike thrown physical weapons (dagger, spear, etc.), alchemical weapon damage is not increased by the attacker’s Strength score.