Contract magic had its roots in divine spells. It was then altered by humans in such a way that even without the supervision of the gods the contract magic would be effective and would bind both parties together.
This showed that humans then already had the powers to replace the gods and they had the advantage of not being bound by the restrictions of the dimension. If humans had not lost their powers for no apparent reason, the dimensions next to the Myers Mainland might have been conquered by humans.
Even though contract magic was unique, it was a magic that showed fairness. One could not force another party to sign the contract. The deed could only be done when both parties were willing.
As for a contract trap, it was to make use of a loophole in the contract magic to make a supposedly fair contract become dangerous assaultive magic.
When it came to contract magic, there were only four grades in this world.
