Chimeramancy is a school of magic practiced in the subterranean city of Vralkast, in Khyber. The Fomor'ren were cursed by the archfey of Thelanis to "resemble the deeds of their ruler", disfiguring them and making them appear like monsters. This filled with them shame, for a time, but these giants founded a safe haven in the most hostile environment on Eberron, their monstrous forms providing safety and security to an untold number of people.
It became a source of pride, and this led to those under their protection seeking to emulate them. The tradition of Chimeramancy began within the Wyrd Vigil, and eventually developed into more general purpose body modifications. Mutagens, grafts, and transmutation magics were all researched and developed, and the Wyrd Vigil of today is filled with individuals who have enhanced their bodies, to better protect their beloved city (and to honour the Fomor'ren). There are few sights more terrifying than a magically enhanced Fomor charging towards you.