A BLOOD OATH is a great deal of promise where it involved two parties; a promisor and a promisee. By conducting a Blood Oath, the promisor is obligated by God's will to keep his promise. No matter what. If the promiser broke the oath, severe punishment would be awaiting. The promisor would brutally lose all of his magic and mana. And in some crises, one could even lose his life in the end; they die a miserable death or suffer from an incurable disease.
That horrible disease would make him emitted a foul smell like a corpse and produced rotten body fluids. And those smells and fluids that emanate from the body will end with flesh-eater maggots coating his skin. Even if the promisor is fortunate to survive the death and the disease, he will have a large tattoo burned on their backs permanently with the big fonts in bold; The Perjurer. The tattoo will hurt him gravely every minute to make him remember his unforgivable sin. And he will live his future life with great suffering.
