Alchemist's Fire (flask)

This sticky, adhesive fluid ignites when exposed
to air. As an action, you can throw this flask up
to 20 ft, shattering it on impact. Make a ranged
attack against a creature or object, treating the
alchemist's fire as an improvised weapon. On a
hit, target takes 1d4 fire damage at the start of
each of its turns. A creature can end this damage
by using its action to make a DC 10 DEX check
to extinguish the flames.
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Cost 50 gp Weight 1 lb