Undead Frenzy

You cause undead near you to fly into a frenzy. Choose up to 8 undead under your control within the spell’s range. For the duration, each undead deals a bonus 2 damage with each of their attacks, becomes immune to the charmed and frightened conditions, and gains advantage on Strength-based ability checks and saving throws.

source: noblecrumpet-dorkvision.tumblr.com/post/179396241811/necromancer-week-new-spells