Commander of the Dead. Zs'Skayr can control any undead within 300ft of him, taking their turn under his command. They must succeed a DC 20 WIS or INT Saving Throw to resist.

Giver of Unlife. Zs'Skayr may take command of any dead creatures within 300ft of him and turn them into an undead soldier for him. They retain their stats from when their were alive, but their INT, WIS, and CHA drop to 10.

Unlive to Fight Another Day. When Zs'Skayr reaches 0 Hit Points, he will choose to teleport away too his nearest base or to his phylactery.

Seasoned Warmage. Zs'Skayr has ADV on CON saves made to maintain concentration on a spell.

Tendrils of Death. Ranged Spell Attack: +12 to Hit, 100ft range, 3 Targets, 12 (1d8+8) Necrotic.

Forceful Wave. Area Attack: 150ft range, 20ft radius, DC 20 DEX 21 (6d6) Force. 3 Charges.

Lich Bolt. Ranged Spell Attack: +12 to Hit, 60ft range, 2 Targets, 13 (3d8) Necrotic. BA Deal damage to targets again. Must use BA for this or the spell fades, targets must stay in range. 3 Charges. 

Banish. DC 20 CHA or be Banished for 1 minute. If used on a creature not native to the current plane of existence, they remain in their home plane. 4 Charges. Can expend 2 Charges to target 1 additional creature.

Life Drain. Zs'Skayr may heal himself for 1/4 of the damage he has dealt this turn. 

Consuming Shadow. DC 20 CON or Moved 60ft. 3 Charges.

Zs'Skayr has 2 Reactions every round.

Shadow Wrap. After receiving damage from an Attack, not an area of effect, Zs'Skayr may cloak himself in shadows, giving all his enemies DISADV on their Attack Rolls against him for 3 turns (not rounds, turns) including the current turn.

Counterspell. Zs'Skayr attempts to Counterspell a caster he can see within 60ft. 3 Charges.

Necrotic Step. Zs'Skayr teleports himself 30ft away after receiving damage.

Zs'Skayr has 5 Legendary Actions to use at the end of another creature's turn.

Lich's Legion (3). Zs'Skayr summons 1d4-1 Knights of Zs'Skayr that take this spot in the Initiative Order.

Tendril Lash. Zs'Skayr may use his Tendrils of Death attack, only targeting 1 creature.