Earthbound Immortal

The Earthbound Immortals are a collection of Level 10 DARK monsters, each tied to a different Type, all sharing the same structural demands: a face-up Field Spell must remain on the field at all times or the Immortal destroys itself, and each one carries the ability to attack the opponent directly while being untargetable by opposing monsters. The individual effects vary considerably across members. Ccapac Apu deals bonus burn damage equal to the ATK of any monster it destroys by battle, Chacu Challhua can repeatedly drain the opponent's LP equal to half its own DEF while also locking them out of their Battle Phase in Defence Position, Uru steals an opponent's monster by Tributing one of your own, Cusillu halves the opponent's LP when it would otherwise be destroyed in battle, and Aslla piscu and Ccarayhua threaten mass destruction upon leaving the field, the latter wiping everything on the board when removed by a card effect.

Earthbound Immortal Red Nova acts as the engine piece that ties the family together. As a Quick Effect usable from hand or graveyard, it sends another Immortal or a Red Dragon Archfiend to the graveyard to Special Summon any Earthbound monster from the Deck or Extra Deck, or bring out Red Nova Dragon as a Synchro Summon. Earthbound Immortal Revival recovers both a spent Immortal and a Field Spell simultaneously from the graveyard at the cost of a discard, ensuring the Field Spell requirement can be restored after disruption.

The trap cards support whichever Immortal is currently on the field. Ultimate Earthbound Immortal provides targeted destruction each turn as long as a Normal Summoned Immortal is present, while Roar of the Earthbound Immortal punishes incoming attacks by destroying the attacker and converting half its ATK into burn damage, provided the Immortal on the field outclasses the attacker in raw ATK.