C1062 Mantra

"That's right, that's right. I almost forgot. There's only a contract between the two of us." Green Rio slapped his forehead, and took out a rolled up goatskin scroll from his body.

This was the contract he spoke of, and it was also a part of the black magic. It was an extreme restriction that no one could use their soul to sign, and no one dared to violate the contract