Pendulum Monster

Pendulum Monster is the new type of Monster Card introduced in Yu-Gi-Oh! ARC-V. They act as either Monster Cards or Spell Cards (hence, their color coding being one half orange and the other half green), and can be placed in the new Pendulum Zone. These monsters can be used to perform Pendulum Summons, a new mechanic that allows a player to perform high-level summons.

Pendulum Monsters, though still treated as Effect Monsters with Levels on the field, use a Pendulum Scale to conduct Pendulum Summons. A Pendulum Monster is first placed in the Pendulum Zone as a Spell Card, followed by another Pendulum Monster in the second Zone, where it then uses its Pendulum Scale to determine the Levels of monsters than can be Pendulum Summoned. When a Pendulum Monster would be sent to the Graveyard, it is placed face-up in the Extra Deck Zone instead. It can be Summoned once again through Pendulum Summoning.

As the "Spell Effect" and the Pendulum Scales take up the space where the Set Number would usually be placed, this value is placed in the bottom left corner of the card instead, in the same line as the ATK/DEF values of the Pendulum Monster.