Long time ago there's a demon, husband and wife who dare challenge the power of the Dark Lord. They might be one of the strongest opponent that Dark Lord ever face, but in the end they both loss, and that loss take the life of his wife.

Now under the rule of dark cultist, the Dark Lord use his wife flesh and soul to forge the living weapon of infinite power. He carry it like the reminder of how weak he is, and take on the mantle "Knight Commander" of the Dark Cultist.