Demon-Dweller Sword: Conquering Eon

Sword Ultimate Magic: Demon-Dweller Sword: Conquering Eon (剣究極魔法『宿魔の剣 覇劫』) is a sword-based Ultimate Magic spell.

Description
The user holds the Demon-Dweller Sword aloft and has it absorb the magic of their allies. The user then swings the sword down and unleashes the collected power in a single slash.

The resulting attack was powerful enough to disintegrate a high-ranking devil as powerful as Zagred, leaving behind his heart, before healing himself, as well as annihilate a section of the Shadow Palace.