User blog comment:B214/Shin DxD 1 discussion/@comment-37165251-20190120152434/@comment-1359322-20190121141347

Well it was mention before in V21.

"“As of now, Trihexa has appeared in the mythological territories of the Greeks, Hindus, Celtics, and Egyptians, as well mountainous areas of Europe and off the coast of Japan in the human world; a total of six locations. It appears that it has split apart according to the number of its heads. In the case of the Hindu mythology, Indra is able to deal with it — that is to say, it’ll be enough for those at Mount Meru to take it on. This might actually be good medicine for Indra. While I’m talking about this, the battle has already begun, and there have already been severe losses everywhere. Several god-class beings have already been temporarily eliminated. Although complete death has been avoided…a considerable amount of human faith is required to bring them back into this world again. This also shows that even after Trihexa split itself apart, its power remains above the level of a god-class being.”"

The question now is how does Ishibumi define complete death.