I Am an Elf but a Necromancer

He traveled to the magical world, became an elf, awakened his magic talent, and was particularly fond of the dark elements but was driven out of the Elf Forest. But he found that this magical world was different from what he imagined. There is no fighting spirit here, only magic, no slaves, only civilians, and no bullying nobles. Everything is like a fairy tale world. But there is a vague evil force eyeing this world...