Homunculus

A homunculus is 1st and for most forbidden so do not try it. Most people who try to resurrect any a human and/or create a homunculus lose parts of themselves in order to feed/make/give to said homunculus. They are made by putting certain elements together using alchemy. The maker of one is taken into waking unconsciousness where they learn all their is to learn about everything. When the awake from this state they remember everything that happened but they come back missing some part of them selfs arm/leg/intestine etc. The human they were trying to resurrect looks deformed beyond human knowledge and stays in that form for an unknown amount of time until they take the form of a human but alway have a heightened ability or a ability that is not human in anyway