Success!!!
Hardest fight I've had to do so far, and it took me a couple of tries to beat him, and you definately want a strong-element team, or a really strong same-element weapon grid, to take him out. He hits like a truck and I needed to strong-element Dark Fencer to debuff him down to where my team, + the one elixir you are allowed, could finish him off. I suppose if I had waited out his buffs, then it would have been easier, but I didn't think of that until the last fight, when I won. He won't reach max potential until level 80, but that won't take too long; hopefully that fate fight, if there is one, isn't as bad as his fight.
One thing I didn't expect, and wasn't on any wiki page that I could see, was that he needed a Dawn Anima, to fully uncap, which is different then a normal SSR character. That's three more True Anima to have handy, but I'm sure the three vary based on the character/element.