Tome of the Ancient and Esoteric Mysteries of the Phantasms of Lyahvi (Harn Fantasy RPG Setting)
Lyahvi is the magic of the air¸ of the insubstantial¸ the invisible¸ the etheral¸ and the illusory. Lyahvian mages are manipulators of light: reflection¸ refraction¸ and confusion¸ with effects faster than the eye and difficult to describe.