Demons

Demons are the source of magical powers. They used to be people, who were later into demons under certain circumstances.

Types
Usually, the power of demons can be sealed inside a small object, which are easy to carry around.

However, as Shinoa explained, if the demons malice is too high, it's very ferocious and won't go disappear so easily. They are also said to be the type that will try to possess its user and its very common for them to engage in close combat to display it's might. Weapons like Yuu's, Guren's and Kimizuki's cannot shrink like other weapons because they are in this category. Shinoa calls these weapons 'possession' types.

Weapons with the power to cast blessings or curses can usually shrink. Shinoa's and Yoichi's weapons belong to this category.

Black Demon Series
They are first rank demons and thus the most powerful. Many of them are aggressive, while others specialize in power amplification and weapon enchantment. Not many people are capable of wielding a Black Demon weapon.

Yaksha
They are second rank demons. Like the Black Demon series, many of them are aggressive, while others specialize in power amplification and weapon enchantment.

Bodhisattva
They are third rank demons. Like the previous demon classes, many of them are aggressive, while others specialize in power amplification and weapon enchantment.

Wisdom Kings
A lower ranked demon.