An Xyz Summon (
How to Xyz Summon
Xyz Summons can be conducted when there are two or more monsters of the same Level on your side of the field. Those monsters can be used as Xyz Materials to Summon an Xyz Monster whose Rank is the same as the Levels of the monsters used.
In order to Xyz Summon an Xyz Monster, you must first take the required Xyz Materials face-up on your side
of the field and stack them together. Then, the Xyz Monster is Xyz Summoned from your Extra Deck, and placed on top of the stack.
Xyz Materials are not sent to the Graveyard. Instead, they are placed on the same Monster Card Zone beneath the Summoned Xyz Monster. In this state, they are not treated as monsters, nor are they treated as being on the field.
In the anime
Xyz Monsters frequently have effects that require you to remove an Xyz Material(s) from beneath it, known as detaching. When this happens, the Materials are sent to the Graveyard. Some Xyz Monsters have negative effects if they have no Xyz Materials left beneath them.
In the anime, using monsters to perform an Xyz Summon is known as overlaying them (similar to how performing a Synchro Summon is known as tuning the Tuner monster with the non-Tuner monster(s)). When an Xyz Summon is performed, a red-colored spiral portal known as an Overlay Network appears. The Xyz Materials turn into forms of energy which enter the portal, and then the newly Summoned Xyz Monster emerges from the portal. Certain monsters, may have unique or specially designed Overlay Networks of a different color or shape. However, in Yu-Gi-Oh! ARC-V, all Xyz Summons so far have used the galaxy-style spiral portal used largely by "Number" cards from Yu-Gi-Oh! ZEXAL.