I actually took out the healing factor, Reaper. I know my limits. Yes, technically, he'd have the skin density of concrete, BUT the healing factor is what makes him invincible. Death, War, Prime, Sinna, Rachel, pretty much anyone can fight him and win. It just takes a bit of strategy. Look: the Mirakuru is going to give Grant intense rage manifesting itself as hand and body tremors. The Hallucinations are going to take away his sanity, at least in part. Use the tremors against him. If Deathstroke can be beaten by children acting in tandem, Grant CAN be beaten. he is NOT invincible. I put his abilities at BELOW Deathstroke level.