Magic isn't inheritently good or evil, it's very neutral. Please don't refer to necromancy as Dark Arts, please, it enforces cliches

If I were to pick some necromancy spells...

Reanimate (No need to explain)
Bone Spear (conjure a spear of bone that is launched at your enemy upon conjuration)
Kiss of Death (touch spell that forces them to make a save vs. magic to not die (only works on creatures below level 15))
Ray of Affliction (a spell that reduces that demoralizes (25), reduces their mana and fatigue by 50, and reduces their damage by half)

Just a few ideas.

about that bone shard spell, i was thinking from oblivion in some caves and where manimarco is, theres those bone spikes coming out of the ground, i was thinking being able to cast a bunch of those beneath the enemy or a cage protecting yourself from harm sor a moment