ΦXyz

"ΦXyz" an abbreviation of "Φως Xyz" [Φως means "light" in Greek], abbreviated "ΦΧ"), is an archetype of monsters that can be Xyz Summoned by Chaos Xyz Evolution, with the effect of "Rank-Up-Magic Glow of Fos". They are 3 Ranks higher than that of the basic forms, a feature only found in them. Xyz Materials attached to "ΦXyz" monsters resemble glowing yellow forms, which create a rainbow when detached, and are called "Fos Xyz Materials".