Blood Demon Art

Blood Demon Arts are spells or techniques that higher-level Demons can cast. The specifics of these spells are unique to each Demon.

Description
Every time a Demon devours a human, the Demon becomes much stronger, and they could eventually develop special, superhuman powers, known as Blood Demon Arts. The power bestowed by the Blood Demon Arts is different from Demon to Demon, and in some cases, Demons are able to use more than one special superpower.

The abilities achieved through Blood Demon Arts can vary greatly. Known examples of these various powers include, but are not limited to:
 * Generation and/or manipulation of natural elements.
 * Alteration of their physical body.
 * A power up transformation.
 * Merging their own body with a preexisting object.
 * Detachment of their own flesh to create and control another entity.
 * Casting Illusions.
 * Putting others to sleep.
 * Exerting control over a preexisting structure.

Weaknesses
Due to the sheer variety of different unique techniques, powers, and abilities a demon develops as they grow stronger, each Blood Demon Art possess their own unique weaknesses and no two techniques or powers are the same.

However a universal weakness to these powers is the fact that they are susceptible to both Sunlight and Nichirin Blades due to the fact that each technique is fundamentally created from using a Demon's flesh and blood, and similarly, the matter created from these techniques would also likely disintegrate once exposed to sunlight and be dispelled or weakened if a Nichirin blade cuts it.

Trivia

 * Despite the ability of Blood Demon Arts being unique only to the Demon race, one can also obtain the ability to use and create their own Blood Demon Art technique by eating the flesh of Demons and gaining pseudo-demon abilities and physiology.
 * Currently, only Genya Shinazugawa was shown to have successfully create his own Blood Demon Art after consuming the flesh of Upper Kizuki One and Four, with the resulting Technique being a combination between the unique powers of both Demons.