FormerlyHemlock
Hero
Any Necromancer should probably have Mending. It's a great way to repair broken bones, so you can keep using the same corpses for Animate Dead over and over again.
I mean, you probably don't even need Mending because Animate Dead doesn't say the pile of bones has to be intact, but some DMs might claim your bones are damaged and cannot be re-animated. Mending overcomes that limitation.
Ditto for old suits of armor and shortswords that you want to give you minions. Necromancers are all about logistics.
Fabricate can be nice for them too.