This skill also does not require Mana to casting the contract, it does not matter how high grade and tier the monster to do the contract, but it requires the consent of the monster, the monster who has contracted at any time can destroy the contract, they can communicate using telepathy with their master. So they cannot be slaves. According to the theory the Great Scholar of the Alliance Union, before the evolution took place, God Tier Monster asks Creator God to protect the earth's life being that will evolve, without this Skill is sure all the Earth monster will be extinct in one year with human's nuclear power.
