Jinmi

Jinmi (実器, literally means "God Seed") also know as the Demon Heart (魔気,Maki) are a set of seven organic chakra entities created by Kaname Soga. Taking the form of oval objects with a set of human facial features randomly across its surface.

History
The Jinki came into existence durning the battle between Kaname and his alter self. Before dealing the final blow he was able to rip the beast Namashinki from Valden's soul, thus preventing him from being reborn through its power and allowing Kaname to put an end to him. Knowing the dangers of beast, following the ideas of the he split the chakra of Namashinki from its body transforming the chakra into seven objects while sealing the body within his dimension. Realizing that keeping them anywhere near the body would be dangerous, he had them sealed within the deepest vaults of the Moon. Decades later, after an assault on the moon, along with damage to the vaults. They fell to the earth.