Let me fill this stuff in since most people here ignore the death essence part of necromancy. Yes necromancy meaning is tlaking with the dead that what it was orginally but it evolved further. Now people can not only talk with the dead but master the spirit there all orts of stuff you can do. It uses the power of death energy or essence to heal sense whos dieing even sap life force. The Ars Falcis site has good information on it.