/vr/ - Retro Games

>>8485431
Simulacrums - suicide enemies, tons of chain-reaction-explosion potential
Juggernaut - Caco/Rev fusion with boss-like HP, flies properly unlike the S'pht, equipped with homing rockets; honestly kind of a boring enemy to fight, just spam rockets or fusion bolts until it nods off, though still more engaging than the Cyberdemon

And if you include the friendlies that you can friendly fire in M2 or fight outright in M-Inf

BOBs - weak quasi-hitscanners not as bad as Blood's Cultists but enough of them in a large room can gradually chip away at your HP
Fusion BOBs - a little tougher in HP but now equipped with blinding fusion bolts that can kill you in seconds
S'pht'Kr - the bulk of a Hunter with twice the damage and an agile patrol-route-based flying AI, extremely threatening
>>8485362
Marathon had some great designs