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'''Xyz Materials''' (pronounced ik-seezexceed<ref name="SD11">{{citeweb|url=http://www.yugioh-card.com/en/products/starter2011.html|title=Starter Deck: Dawn of the Xyz|publisher=[[Konami]]}}</ref>, エクシーズ素材, ''Ekushīzu sozai'', known as '''Overlay Units''' in the [[Yu-Gi-Oh! ZEXAL|anime]]), are the result of [[Monster Card|monsters]] being used in an [[Xyz Summon]]. When an [[Xyz Monster]] is Summoned, the monsters used in the Xyz Summon are stacked underneath the monster instead of being sent to the [[Graveyard]] (referred as being "Overlaid" in the anime), and so only one [[Monster Card Zone]] is occupied. Xyz Materials are essential to Xyz Monsters as in most cases they are used for a [[card effect]], such as that of "[[Number No 17: Leviathan . revise Dragon]]". Removing an Xyz Material for the effect of an [[Xyz Monster]] is referred to as "[[detach]]ing". If the Xyz Monster is [[destroy]]ed or [[banish]]ed from the [[Playing Field|field]], any associated Xyz Materials are [[send|sent]] to the Graveyard. When an Xyz Material stacked under an Xyz Monster is removed or detached, it is sent to the Graveyard. Removing all of the Xyz Materials associated with an Xyz Monster can have negative consequences, as in the case of "[[Number 39: Utopia]]".
Xyz Materials underneath Xyz Monsters do not count as monsters, so if "[[Dimensional Fissure]]" is on the field, detached Xyz Materials will be sent to the Graveyard. Xyz Materials are also treated as not being on the field, so effects like "[[Sangan]]" do not activate, and "[[Plaguespreader Zombie]]" will be sent to the Graveyard when detached even when it was Summoned with its own effect.
