The problem with Savage Opress...

So, for the most part, he's pretty cool, but there is one glaring flaw that shows up when he's in a March of War against himself, or other tough regenerators. He doesn't do enough damage unless the target has already taken enough damage. Two Zeta's Savage facing off and you may as well retreat and try again, because they can't hurt each other.

I'd suggest adding a unique to him "Mounting Rage" or something like that. Every turn, he loses 10% chance to crit, but gains 10% damage, both stacking. This way, eventually he'll be doing enough damage consistently that he can put his mirror down to half health or more with his primary attack, and if he survives his mirror's next attack, can kill him. Even if both remain equal, it eliminates those battles where you can set auto and go to the movie theater and come back to find them still going at it.