Devil

Devils (悪魔) are an ancient race of magical beings that dwell in the underworld.

Overview
Devils are generally large and humanoid in appearance with pointed teeth, horns, long thin tails, and bat-like wings on their backs. Other devils have more bizarre and monstrous physiologies, like multiple eyes, tentacles, and bug-like mandibles.

Because devils come from the underworld, their mana is known to be malicious and sinister in nature, thus their magic attributes are particularly formidable and frightening. Only negative mana, other devils' powers, and arcane magic can counter devils' magic.

Normally, devils cannot appear in the living world on their own. A mage can use Forbidden Magic and a sacrifice to summon a devil and use its power. Devils cannot wield or enter a grimoire until it has a five-leaf clover. Once they have a grimoire and a physical body, they can unleash their true forms and power in the living world.

The devils have a caste society, with low-ranking devils disparaged and looked down upon by the more famed and higher-ranking devils, like Lucifero.

Devil Hosts
Devil hosts (悪魔憑き), or devil-possessed, are humans who directly share power with devils. The host gains an immense boost in power and the ability to use the devil's magic attribute in addition to their own. When the host draws on this power, their body takes on devil-like physical characteristics, such as horns, elongated canine teeth, pitch black skin, clawed fingers and toes, bat-like wings, and a long thin tail. However, it is impossible for a human host to access 100% of their devil's power, unless a direct channel is opened between the living world and the underworld or the devil inhabits a five-leaf clover grimoire.

A devil host can also share some of the devil's power to their underlings. While these underlings cannot use as high a percentage as a devil host, the boost to their magic power still makes them formidable mages.

A devil host can undergo the Devil-Binding Ritual (従魔の儀), in which they fight their devil and make a formal contract with it to use its power as their own. Without this ritual, a devil host cannot access their devil's full power, instead only the trace amounts of it that naturally trickle out. The connection is forged through a relic linked to the devil, and through this connection, the devil can temporarily be brought to the living world.

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