It bothers me since the odds of a continuation to Pandaemonium don't seem particularly likely, which makes you question why they bothered to even put this in here. I can only guesstimate, but I suppose the Warriors of Light of the Thirteenth Shard utilized Auracite to bolster their powers during the Contramemoria war. Assuming of course that hasn't been retconned and I simply missed it. So I suppose they could take it somewhere, though that still begs the question as to how the High Seraph comes into play. It just feels dirty, you don't just introduce what is basically Jenova/Lavos into your setting and then completely leave your players hanging.