Beat this crazy thing just now. Took me 4 hours exact at level 88 straight fight, no running to the crystal. Seemed like way more than 50mil HP. Zerked Basch (Masamune + Genji gloves) and Vaan (Durandal + Strongest Shield) with me controlling Ashe on the side mostly healing, keeping berserk/decoy up and swinging a few times with Tournesol.
Anyone else here beat this crazy thing? And what time/setup?