edit: i got to it, apparently you need to go break into pandora with ragnarok before you can go back and fight him.
ps i totally raped him
is there a save point next to the hole? if theres not then leave and come back and there should be a way down. this happened to me.
everywhere i looked said ‘just leave and come back’ and for me it wasnt that simple.
Man, seriously. My pride was broken… D: