The great god of nonexistence. As she is quite cranky and irrational, athiests pray to her, asking her not to exist. Non-athiests commonly point out that Athe cannot be prayed to, as she is nonexistent. The answer to this is, of course, is that Athe has a reason for everything and you should not question it.
"Athe gives her thanks, child...or she would, if she existed..."