Epic Games, The FunktasmSprites:
Eriance, KDiZD Team (Projectile)Sprite Edit:
Ghastly_dragon, Infernus, XaserIdea Base:
Fallout 3's Experimental MIRV.
The HellStorm fires a cluster of impact grenades. Individually, each impact grenade has only half the explosive potential of a rocket, but the entire cluster has a total of four times the yield, easily able to clear a swarming group or a more powerful demon with a single shot.
The drawback is that the weapon takes some skill to fire correctly. One mis-fire could smear a careless marine across the walls, and the spread itself it difficult to aim correctly. It also has a reload time greater than that of the rocket launcher, and must reload after every shot.