Ok, this is a nasty fight, not only his brand new atks that he didn't have in base pso2 become unblockable/unavoidable, but you got only 10 mins, and the HP is buffed to go with that time limit, it's clearable with tricelio/trisatsis stuffs, but it'll be close. Anyway, enjoy the new music that comes with it! They brought back Omega language lyrics in 2nd half! ^^
Btw, his ultimate atk gets reworked again, and it's become more cinematic, definitly worth checking it out, even though you're likely to die as the final hit is so hard to time right oof!