A massive (1.58 meter in length) fictional pump action shotgun that I came up with chambered in 1 gauge shotshells (bore about 1.95 inches/49.53mm) instead of those puny 12 gauge shot shells (0.729 inches/18.5mm). The gun is so massive and the 1 gauge shot shells are so huge that the gun would not make much sense in reality as the thing would be way too heavy for a normal human and the recoil from it would be that of a small 1 pounder cannon. The gun was inspired primarily from Doom (Hence the name of the thing) and Warhammer 40k, both of which have plenty of ridiculously large shotguns in their settings. This type of shotgun is the perfect weapons against other worldly opponents, demons, chaos spawn, the undead etcetera.