Oil

A flask of oil can be used as a grenade-like missile. The oil must be set afire in order to inflict damage; otherwise the oil is just slippery. Assuming some means of igniting the oil is at hand, a direct hit to a creature deals 1d8 points of fire damage, plus in the next round the target takes an additional 1d8 points of damage, unless they spend the round extinguishing the flames by some reasonable means. The GM must judge the method used; rolling on the floor (assuming it's not oily also) or covering the flames with a wet blanket are good methods, for instance, while pouring or splashing water on burning oil does little good. In any event, a flask of burning oil only causes damage for two rounds at most. If the oil is ignited by some sort of wick or fuse, then all other creatures within 5 feet of the point of impact receive 1d6 points of fire damage from the splash. A save vs. Death Ray is allowed to avoid this damage. If the flask does not hit the intended target (as described under Grenade-Like Missiles, above), then that creature may still take damage from the splash, and receives a saving throw. No saving throw is allowed for a creature which has received a direct hit. A flask of oil spilled or splattered on the ground will burn for 10 rounds. Those attempting to cross the burning oil will receive 1d6 points of fire damage each round they are in it (with no saving throw in this case). Fire-resistant creatures, including creatures having firebased abilities, are not damaged by burning oil.