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Fusion Materials (Japanese:
While Fusion Materials can be specifically named monsters, they can also be more general. For example, "Five-Headed Dragon" simply requires 5 Dragon-Type monsters, and "Chimeratech Overdragon" requires 1 "Cyber Dragon" and 1 or more Machine-Type monsters.
Listed Fusion Materials are monsters specifically named on a Fusion Monster as materials; cards that specify listed Fusion Materials, such as "Centrifugal Field", cannot affect Fusion Monsters that do not specifically name Fusion Materials, such as "Five-Headed Dragon".
Fusion Materials can be used even if the Summon is not a Fusion Summon. Cards in the Hex-Sealed Fusion series Tribute themselves and the other necessary Fusion Materials specified on a Fusion Monster to Special Summon it, but this Special Summon is not treated as a Fusion Summon. Contact Fusion is also a type of Special Summon that uses Fusion Materials to Summon a Fusion Monster, but is not a Fusion Summon.
Fusion Substitute Monsters such as "King of the Swamp" can replace one named Fusion Material. If a Fusion Substitute Monster is used, all other Fusion Materials used in the Fusion Summon must be correct. However, monsters whose name is being treated as a listed Fusion Material (e.g. "Elemental HERO Prisma") are treated as correct and not as Fusion Substitute Monsters. Fusion Substitute Monsters can only replace specifically named Fusion Materials; as such, a Fusion Substitute Monster cannot be used in the Fusion Summon of "Evil HERO Dark Gaia" as it does not name any monsters, and can only replace "UFOroid" in the Fusion Summon of "UFOroid Fighter".
There are also several monsters which cannot be used as a Fusion Material.
- Extra Deck
- Fusion Monster
- Fusion Summon
- Fusion Substitute Monster
- Cannot be used as a Fusion Material
- Konami. Yu-Gi-Oh! Official Card Game - Perfect Rulebook 2015. p. 72.