On this boss now and i have died 2 times + all my aeons are on overdrive.
I got to her final transformation, then she just kept killing off my characters , i didnt have enough time to heal.

I followed the guide but i missed some good advice (save aeons till last) any other tips on how to beat her ?
I need Holy but on the sphere grid it is blocked by a level 3 key , and i only have 1,2 & 4