What Christmas has taught me:

[Ptah]

@Ptah: It's a once per account quest with a unique item at the end.

So you say this "unique" item is so valuable it shouldn't be gotten more than once per account? Oh please >.>
I'd sure count this halloween oogie boogie hat into "unique" section, now this monstrosity. It has other elemental resistances that can be gotten from other hats better (+other hats have set bonus with wings of same ele, not to mention constant bonus without changing every season), and refining bonus is totally lost due to it's "uniqueness", and what's left? A useless hat that isn't even worth to wear over other hats previously available >:

EDIT: I'll kill any pony Circe gets.