Flask of Alchemist's Fire

•This sticky, adhesive fluid ignites when exposed
to air. As an action, you can throw this flask up
to 20 feet, 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, the 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 Dexterity check to extinguish the flames.