Just don't follow the whole "fighting god" cliche every RPG follows. FFXII did it right.
Fighting god?
as in a god of fighting, or fighting against god (the latter more likely being what you implied)
Eventually its going to end up as a certain 'god' being the creator and source of the monsters that have so recently infested their world...
...sorry if thats too cliche.
And ive never played XII.
I can assure you, plot twists galore exist.
Or, a few of em, atleast.
Of course, one of them might be a cliche plot twist... (heh, interesting thought.)
You could say I stole ideas from a bunch of games...
...but I didn't actually steal them. Its just that certain parts of the concept, ironically, as similar in part to other games.
...and thinking the other way around is just how this plot progresses. Somewhat.
EDIT: Yes, as for the intro that I posted up there, and the next "chapter" that I wrote, its pretty dull on paper.
These two chapters would go by in a matter of the players first 10 minutes... thats why it seems slow =D