Ok so this weapon is called Ravager. It is an epic? Weapon that looks like a drill attached to a rocket launcher but made to looked like that was intended and more futuristic. How it works is when fired the rocket powered drill will hit and enemy, and deal continous damage and end in an explosion. If the enemy dies before the drill explodes, the drill just keeps it's momentum and fires of into the horizon, until it conveniently hits another enemy, but the more enemies it hits, kills, and rockets past to hit another, the shorter the drill damages an enemy until it explodes. So yea here's soma da stats when maxed:

Magazine: 5

Dmg per shot: 15000->0 (damage gradually falls off the more enemies it hits)

Dmg per magazine: 75000

En variants: 8, 10, 12, 14, & 16

Yea maybe a bit unpolished but I like the idea and the rest of the stats may be speculated!