CXyz

"Chaos Xyz", abbreviated "CX" (CXカオスエクシーズKaosu Ekushīzu), is anarchetype of monsters that can be Xyz Summoned by Chaos Xyz Evolution, with the effect of cards such as "Rank-Up Magic - Barian's Force".

These monsters are created by the heralds of Barian World for the sole purpose to subdue the "Number" monsters.[1]

It Xyz Materials attached to "Chaos Xyz" monsters are referred to use "Chaos Overlay Units" in the anime as evidenced by the fact the overlay units are shaped as neon red diamonds instead of the usual look.