Cable's BFG (5e Equipment)
From D&D Wiki
Martial Ranged Weapons
A gun modified and made by a time traveling revengeful cyborg, this gun has some interesting functions.
Grenade, Launcher. The gun has a underbarrel grenade launcher. With the underbarrel grenade launcher, you can propel the grenade up to 200 feet away as an action. Once you have fired a grenade from an underbarrel grenade launcher, you must use an action or bonus action to reload it before you can fire it again.
Sonic Shot. As an action trigger a switch of the gun and aim, which emits a thunderous blast in a 45-foot line that is 5 feet wide that is audible 50 feet away. Each creature in the line must make a DC 15 Constitution saving throw. On a failed save, a creature takes 5d6 thunder damage. On a successful save, a creature takes half as much damage. Creatures and objects made of glass or crystal have disadvantage on the saving throw and take 10d6 thunder damage instead of 5d6. Each use of this feature uses 1 energy cell.