A pact is an ancient form of magic that binds together the life force of a human a magical creature, essentially making them a singular entity. The strength and magical abilities of each member of the pact get enhanced incredibly and gain the ability to speak to each other telepathically.

However for the pact to be complete the human must lose a part of themselves, be it psychical or abstract and due to the fact their lifeforces are connected, if a single member of the pact dies them both members do. Once the pact is complete there are few means in which one can break it.