Kekkai

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In Japanese mythology, a kekkai 血塊, lit. blood lump, is a blood homunculus created during a childbirth that is not sanctified. It is a hideous, amorphous blob of blood that lurks about and frightens people with its horrible appearance.

Due to all the taboo surrounding blood in Japanese culture, a special ceremony must be performed to remove the impurity. If this act was not performed, a kekkai was formed and created havoc and fright among the village until the rite was completed.

Kekkai, 結界, is the Japanese word for a protective ward, which is entirely unrelated to the blood homunculus.