Draining Jaws

You target up to 4 undead under your control within the spell’s range. Each of those creatures gains a bite attack if they didn’t already have one. The new attack deals 1d6 base damage, is Strength-based, and is a melee attack. You regain hit points equal to the damage dealt by each of those creatures’ bite attacks.

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