By Bahamut.Celebrindal 2020-01-27 11:18:15
I soloed this a few times on RDM/NIN before crocea mors and just whittled away at him with enspells during Invincible periods, chaining when I could to burst.
Now, with the addition of Crocea Mors pumping up that enspell damage, I'd without question go that route again, only lock Ullr in place as well to go Empyrean Arrow>Savage Blade>CDC for double light, and even 2 stepping just Empy Arrow>Savage gives a light to burst off of. If Invincible up, I'd just build TP for enspells, and hope I had TP already for Seraph. I haven't tried Sanguine on him...it could have high potential.
RDM gives you a ton of tools for something like this. It would be the route I'd go, or if you can 3box with GEO+COR+RUN, I'm sure that route would be highly effective as well...you'd just run into some issues during that Invincible spam.