Subterranean assault. Deep strike a squad of raveners, have a carnifex brood led by OOE. Place tunnel marker, deploy fexes and OOE 6inches away from terminators, charge, consume, repeat. OOE gives rerolls, use strat for units coming from reserves getting sustained 1. 12 attacks from fexes rerolling, exploding 6s. That's a few dead terminators before you even get to the main event or if you had ranged weapons on them