Serah

"Ah, I see why I'm a child in your eyes then. I'm almost half as old as you..." Looking through her illusion, she looks over the crest once again. "and 4 centuries... I'd have gotten rather bored in you place. I wonder, would you happen to remember an attack on the central wall some 8 decades ago? I believe it was lead by a bloated member of the Hezrou caste who found himself alone with his followers after his initial charge. Not that that was any deterrent for him, really."

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Well, there's the Heighten Spell-Like Ability feat from Complete Arcane, but it's limited uses for a +2 boost to DC.

And don't worry too much about the above, I've got 180ish years of crawling up the demonic hierarchy to to flesh out, why not have her stand on before the gates to celestia at least once