Oil (flask)
Oil usually comes in a clay flask that holds 1 pint.
As an action, you can splash the oil in this flask onto a
creature within 5 feet of you or throw it up to 20 feet,
shattering it on impact. Make a ranged attack against a
target creature or object, treating the oil as an improvised
weapon. On a hit, the target is covered in oil. If the target
takes any fire damage before the oil dries (after 1 minute), the target takes an additional 5 fire damage from the
burning oil. You can also pour a flask of oil on the ground
to cover a 5-foot-square area, provided that the surface
is level. If lit, the oil burns for 2 rounds and deals 5 fire
damage to any creature that enters the area or ends its
turn in the area. A creature can take this damage only
once per turn.