Xyz Material Monsters (エクシーズ素材, Ekushīzu sozai) are the result of monsters being used in an Xyz Summon. When an Xyz Monster is summoned, the monsters used in the Xyz Summon are placed underneath the monster instead of being sent to the Graveyard. These monsters may be used for a card effect, such as the effect of "Number 17: Leviathan Dragon".

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