I can't give away too much since I haven't written it yet, but here's a taste of what came to me last night:
Belial knows Faith's potential & wants to bate her to use her power in a full-out explosive burst. This would set-off a chain reaction: causing the barriers between the two worlds to crack, melding elements of the two worlds, causing Enlita to crumble, and seeping Enlita's energy to earth creating mutations to all living things.
The index cards, with all the ideas, are now pinned to my writing board - reminders to weave the elements into the story in the appropriate places.
I love epiphanies, I just wish I had more control over them. This was a big moment.