Drakegun (5e Equipment)
From D&D Wiki
Martial Ranged Weapons
Created by dwarves, the drakegun is a weapon made primarely to shoot loads of alchemist fire against your opponents, spreading the substance to affect more targets with its effects.
Special. You use a alchemist fire flask to load the drakegun. Instead of making an attack roll, all creatures in a line equal to the weapon's range long and 5 feet wide need to succeed on a saving throw against a DC of 8 (if you aren't proficient) or 8 + your proficiency bonus + your Dexterity modifier (if you are proficient), or suffer the effects of being hit by alchemist fire. Creatures at the long distance range have advantage on the check. One shot depletes a flask of alchemist fire.