A long time ago, I remember reading a book which introduced new spells that allowed a player to take abilities from monsters by performing ritual magic that gave them the body parts associated with those powers.
I do not remember the name of the book but I do remember that there was a flavor text excerpt where someone attempted to gain the lungs of a gorgon so they could use its petrifying breath weapon. The person either died from asphyxia during the ritual due to losing their lungs during the ritual before getting the monster organ or woke up from passing out with a metal bull head.
In another excerpt I remembered an evil wizard's apprentice finds that his master was killed by the rat headed human bodied soldier creation that he was experimentally creating using the magic from the book.
I vaguely have the idea that this book was part of a series detailing 3rd party variant "spell schools" but I do not remember what the topics of any others in the series would have been so I may be mixing this up with a different book.
Does anyone know the name of this book or who published it?