Bumpity bump bump bump.
I would play that Warlock class literally all day. It would be awesome if you could just roam around patrol with a few dozen of your resurrected foes as your personal army. And in Raids. You'd finish with several hundred enemies with you. But you shouldn't be allowed to raise Ultras to fight for you. Majors are fine, ultras are not.
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Well it would be pretty OP if they lasted forever. The ability should only be temporary.