Sarren
A world where the inhabitants each have certain powers contained in their soul. This power can only be harnessed if a person has been gifted with a special gateway, which grants their soul access to the outside world, and allows them to utilize it as a weapon, tool, etc. Whoever controls someone's gateway controls their soul's power, and by default, them as well. If someone dies while in possession of their own gateway, their soul passes as well, but if the gateway is in another’s ownership, the soul remains trapped in the gateway until it is returned to the deceased owner.