Lore2 or more monsters with the same Level
(This card's Rank is equal to the level of the 2 monsters used to Xyz Summon this card.)
Cannot be destroyed by battle, and is unaffected by card effects, except it's own effects. You take no battle damage from attacks involving this card. At the end of your opponent's Battle Phase, if this card was attacked by an opponent's "Number" monster, You can target that card; take control of that monster, but it cannot declare an attack or activate its effects. Once per turn, you can detach one Overlay Unit from this card and target one "Number" monster other than this card: Special Summon, (from your Extra Deck,) 1 "Number X" monster with the same Type as that monster you control, by using the target and this card as Xyz Material. (This Special Summon is treated as an Xyz Summon. Overlay Units attached to it also become Overlay Units on the Summoned monster). If this card is attacked while it has no Overlay Units: Negate that attack, and if you do, Special Summon, (from your Extra Deck,) 1 Number CX0: Cross Overlord Ultra, using this card as Xyz Material (This Special Summon is treated as an Xyz Summon).