Oil (flask)

As an action, splash within 5 feet or throw
up to 20 feet as a ranged attack with an
improvised weapon. Ground coverage
is a 5-foot-square area. Oil is ignitable for 1
minute. 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.