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.
The battle positions of the Xyz Materials do not matter, as long as they are all face-up. However, once you have Xyz Summoned your Xyz Monster, ensure that the entire stack is neatly aligned in face-up attack position, regardless of whether or not the Xyz Monster is summoned in face-up ATK or DEF position.
An Xyz Summon is a type of Special Summon, and an Xyz Monster is a Special Summon-only monster.
Xyz Monsters frequently have effects that require you to remove an Xyz Material(s) from it. In this case, the required Xyz Material(s) are taken from beneath the Xyz Monster and sent to the Graveyard. This is known as detaching. Some Xyz Monsters have negative effects if they have no Xyz Materials left beneath them.
Note that an Xyz Monster Special Summoned via any means other than an Xyz Summon (except in certain cases such as with "Xyz Reborn") will not have any Xyz Materials beneath it. Therefore, any negative effects that might apply to an Xyz Monster in such a state will be applied immediately.
If an Xyz Monster leaves the field, its Xyz Materials are sent to the Graveyard. If an Xyz Monster is flipped face-down, its Xyz Materials stay where they are.
Since Xyz Materials are not monsters, they will not be affected by a card like "Dimensional Fissure" that causes only monsters that would be sent to the Graveyard to be banished instead. While "Dimensional Fissure" is on the field, detaching Xyz Materials still sends them to the Graveyard. If the Xyz Monster leaves the field, its Xyz Materials are still sent to the Graveyard, and if the Xyz Monster is destroyed, it will be banished while its Xyz Materials are sent to the Graveyard.
If a card effect banishes all cards that would be sent to the Graveyard (such as "Macro Cosmos" or "Banisher of the Radiance"), then when an Xyz Monster leaves the field, its Xyz Materials will be banished. An Xyz Monster can still detach its Materials while such an effect is active; the Xyz Materials will be banished instead of being sent to the Graveyard.
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, especially "Number" monsters, may have unique or specially designed Overlay Networks of a different color or shape. The idea of a spiral-shaped portal is derived from Konami's statement that Xyz Monsters entered our universe through a black hole.
How to Xyz Summon
- When Xyz Summons were first revealed in the OCG, they were mistakenly translated as "Exceed Summons" by fans. This was likely because "Xyz" is not an actual word and has no immediately obvious pronunciation. The word "Exceed" was likely the closest English equivalent to the Japanese "エクシーズ Ekushīzu".