Soulbound Instrument. Each speaker lich carries a lute infused with their soul. Whenever the lich dies, their body disintegrates into a pile of dust and their lute vanishes into thin air, appearing in a random location within 200 miles of the location they died. The lich reforms 1d10 days later with full hit points at the lute's location. The lute can only be destroyed by casting divine word on it while the lich has not regained a physical form.

Legendary Resistance (3/Day). If the lich fails a saving throw, it can choose to succeed instead.

Unusual Nature. The lich doesn’t need air, food, drink, or sleep.

Multiattack. The lich makes one Accursed Word attack and uses Spellcasting.

Power Word Drain. Ranged Spell Attack: +20 to hit, reach 30 ft., one creature that can hear the lich. Hit: 15 (3d10) psychic damage. If they are reduced to 0 hit points by this ability, the lich gains temporary hit points equal to 10 x their charisma modifier and advantage on all Charisma checks and saving throws while they have the temporary hit points. 

Spellcasting. While holding its lute, lich casts one of the following spells, using Charisma as the spellcasting ability and requiring only a verbal component (spell save DC 18):

At will: charm person, vicious mockery, prestidigitation, healing word (can affect self)

2/day each: dispel magic, confusion, power word stun, power word pain

1/day each: divine word, power word kill, glibness

Power Word Vengeance. Immediately after taking damage, the lich utters an enchanted word. The creature who damaged it must succeed on a DC 18 Charisma saving throw or take 2d8 psychic damage and become stunned until the end of their next turn.