When used to make a successful ranged combat attack (slid as weapon on the combat board), this alchemical weapon will deal Fire damage to the monster. Though it is not stated on the token, the thrower need only hit AC 15 or higher. It is usable only once, whether the attack succeeds or misses.
It also may be used to ignite combustible substances.
Like all alchemical weapons, this item will deal double damage if the attacker scores a “natural 20”