Every time a demon devours a human, the demon becomes stronger, and they can eventually develop special, magical, supernatural 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 of them. As suggested by its name, all supernatural abilities and techniques use their wielders' blood as a medium to manifest themselves in reality.
The abilities/techniques achieved through Blood Demon Arts can vary greatly, some can be more combat-orientated than others or some more complex and difficult to decipher, making the abilities of demon-kind extremely versatile and powerful. Known examples of these various magical powers include, but are not limited to:
- Generation and/or manipulation of natural elements.
- A power-up transformation.
- Merging their own body with a preexisting object.
- Manipulating poisons and acids.
- Creating and controlling a separate entity.
- Casting illusions.
- Putting others to sleep.
- Controlling another person's mind.
- Exerting control over a preexisting structure or object.
A universal weakness to Blood Demon Arts is that they are susceptible to both sunlight and Nichirin weapons, meaning that they will disintegrate or be dispelled when exposed to sunlight or cut with a Nichirin weapon, possibly attributed to the fact that each ability and technique is created from a demon's flesh and blood.
Another weakness is related to the a demon's blood, where if in some situation where their body's blood gets depleted, they will be unable to use their Blood Demon Arts. This is evident in Kokushibo being unable to unleash any crescent moon blades when Genya Shinazugawa's blood-sucking trees are holding the Upper Rank down.
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