Alchemist's Doom (Large Flask)

Designed by Artificers for use with the Catapult spell, this large flask, contains 5 doses of Alchemist’s Doom, that deal 10d6 fire damage at the start of the target’s turns.  The flask and payload weigh exactly 5 lbs. and is designed to shatter on impact. 

Alternatively, 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 doom as an improvised weapon. On a hit, the target takes 30 (10d6) 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.