I strongly believe that you do not understand what necromancy really is . It is simply a form of divination through the dead . It is not really a form of magic , rather , it is a form of divination .
So in fact , you are literally making no sense whatsoever when you have learnt the various forms of magic related to necromancy . I don't think you really understand the term .
Also , I wish to inform you that though some games depict necromancy as a skill after wielding Fire and Ice , and even some instances , healing , but I assure you , that is fantasy .
It is very different as portrayed in games , so do some additional research please , it will be a eye opener for you .