thought of a fun ultrakill oc:
machine in a similar vein to the original swordsmachine (heavily modified its own framework without following any sort of existing design) where its most recent internal modification is retrofitting their own internal system to use hell energy for power in place of blood. it's also salvaged parts of V2 and used them to enhance its speed and agility
it also has a weapon of its own make that utilizes hell energy to create projectiles similar to those thrown by the Cerberus-class demons, and has designed its hell energy fueled core to be able to open up and fire a concentrated, destructive ray of the stuff