Master Monsters are a new Monster Cards Type and are coloured red-brown. It stated like Fusion Monsters or Synchro Monsters, so it has similar ability with them. It may only be included in the Extra Deck, and cannot exist in the hand or Main Deck. If a Master Monster is returned to its owner's hand or Deck, it is instead sent back to the Extra Deck.

The concept of summoning Master Monster is like as Fusion, but you don't need to use Polymerization and the like, as Fusion summon need specific monsters as Master Material, Master monster just need monsters that have the required-level that written on the card.

If a Master Monster is Master Summoned property to the field, and then sent to the Graveyard, it can be Special Summoned to the field from the Graveyard with cards such as Premature Burial, Call of the Haunted, or Monster Reborn. Any Special Summon from the extra deck will not allow to revive it from graveyard by such cards.

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