CXyz

"Chaos Xyz", abbreviated "CX" ( Kaosu Ekushīzu), is an archetype of monsters that can be Xyz Summoned by Chaos Xyz Evolution, with the effect of "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. Xyz Materials attached to "Chaos Xyz" monsters are referred as "Chaos Overlay Units" in the anime. Like monsters that can do Chaos Xyz Evolution, these monsters too require an additional Xyz Material in a regular Xyz Summon but with 1 higher Rank since they are Rank-Up monsters.