Is Necromancy illegal in Waterdeep?
Nowhere in the Legal Code from Waterdeep: Dragon Heist does it say one way or the other, nor even is it implied within any other rule - not even those related to religion, temples or gods.
I do think that if you use a necromancy spell to raise a corpse, you're sort of "stealing" the body of somebody's relative. In Waterdeep, is that considered theft?