Felo’thore’s transformation sequence.

The runes engraved across his chest and back were a gift from Elune and allow him to take the form of a moonkin to enhance his Astral magic abilities. Initial pain was experienced when he first got the tattoos but as of now the only discomfort he feels is minor itching if he’s caught halfway in sprouting feathers.
I guess you could say he evolves like a pokemon….with more glitter and feathers.