Crown of the Necromancer

Animate Greater Undead (V,S,M)
Action, Once per Day, Duration 1 minute
You infuse a corpse, pile of bones or one of your undead minions with necrotic energy, creating a Greater Undead monstrosity under your control
for the duration.
Sacrifice Undead (V,S,M)
Bonus Action, Once per Day, Instant
You sacrifice a number of your undead minions, draining them of necrotic energy and gaining 1d6 healing for each minion sacrificed.