You say that it doesnt make sense by stating that Im killing D&D, even tho Im not using any other know game as referal for my classes. D&D didnt created the word druid, the first meaning of the word doesnt says wich kind or magical element it uses, Dungeons and Dragon's concept isnt absolut.
I can do whatever I want with my druid, even shoot rainbow lasers if I want. If in the mythology I created for Thronar is possible for a druid to become a necromancer, then it is.
D&D is absolute.
Having a druid create a rainbow seems more plausible, than one becoming a necromancer.
There is always a basis you begin from, you wouldn't have a chicken shoot lazers out it's ass because it's just silly. Your druid is that silly to me.
I'd rather not have this discussion on a full scale tbh though, because your clerics are just as bad.