Seems more like Hydaelyn is the planet itself or at least the light side of the planet. It's most likely just a equivalent of the goddess from FFXI (forgot her name) while the dark god the Ascians work for is the "Promathia" of FFXIV. Won't be surprised if we're dragged into this whole light vs dark war where both sides try to destroy the other just for it to turn out that due to some "balance" sort of issue if one destroys the other side they're destroyed too or something like as long as one exists the other will exist to balance it out.