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Kluex is the god worshipped in the (only organized) Avian religion, Kluexism. Avians believe they were stripped of their wings as punishment for entering the mortal world and will only regain their wings in the afterlife should they achieve absolution through worship.
Players may find Avian temples scattered across the universe. Most Avian NPCs appear to be Kluexist, but some are not. These Avians are collectively refered to as the grounded.