Demon-Dweller Sword

The Demon-Dweller Sword (宿魔の剣) is an ancient Anti Magic Weapon. Asta finds the sword in a hidden room within a dungeon treasury.

Description
The sword is summoned out of an opened grimoire, inside which it is stored in the form of writing. The user can easily summon the sword at will without consuming any magical power.

The sword has black markings on the blade and is mostly covered in dirt. The sword also has a heavily ornate hilt with a four-sided guard, a grip with a spiral design, and a sphere for the pommel. The sword is capable of cutting magic with its edges and absorbing other people's magical power.

The sword's original ability is to absorb spells and then to release that magic in a flying slash. After the sword has absorbed a certain amount of magical power, the black markings on it start glowing with a color corresponding to the absorbed magic attribute. At that moment, when the user swings the sword, it unleashes a flying slash with similar properties as the absorbed magic attribute. Alternatively, it is also capable of being filled with Anti Magic, releasing flying slashes composed entirely of Anti Magic.

Another ability the sword possesses is connecting the wielder to their allies. With this ability, the wielder could draw magic power from their allies over a large distance or could transmit magic and information to their allies.

It has been noted that the sword passively absorbs magic from anyone holding it and is immensely heavy. This absorption ability can be used offensively by impaling an opponent and letting the sword drain the victim's magic power and weakening their enhancements.

When the sword is wielded by Asta and Liebe's Unite form, spikes and a knuckle bow extend from the sword's guard, and the Black Slashes are much larger in size.

After learning Zetten, Asta could pull off the reverse method of wielding the Demon-Dweller Sword, instead of drawing magic from allies, he instead channels Anti Magic into them, cloaking them in it.

Trivia

 * In Tales of the Rays, Asta can use the Demon-Dweller Sword to perform the following strike artes: Demon-Dweller: Flash (宿魔・一閃) and Demon-Dweller: Instant Slash (宿魔・瞬斬).
 * Asta can also use both the Demon-Slayer Sword and Demon-Dweller Sword to perform the following strike artes: Demon-Slayer and Demon-Dweller: Rotation (断魔＆宿魔・旋圏) and Demon-Slayer and Demon-Dweller: Blade Flat (断魔＆宿魔・剣脊).

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