Corrupted Lich

Inescapable Destruction. Necrotic damage dealt by the lich's cleric spells ignores resistance to necrotic damage.

Reaper. When the lich casts a necromancy cantrip that normally targets only one creature, the spell can instead target two creatures within range and within 5 feet of each other.

Special Equipment. The lich wears a Ring of Mind Shielding. While wearing this ring, the lich is immune to magic that allows other creatures to read its thoughts, determine whether it is lying, know its alignment, or know its creature type.

Turn Resistance. The lich has advantage on saving throws against any effect that turns undead.

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

Multiattack. The lich makes two claw attacks.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) slashing and 14 (4d6) necrotic damage. If the target is a creature other than an undead, it must succeed on a DC 12 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Invisibility. While wearing the Ring of Mind Shielding, the lich can become invisible until it uses another action to become visible, until it removes the ring, or until it dies.

Spellcasting. The lich casts one of the following spells, using Wisdom as the spellcasting ability (save DC 14, +6 to hit with spell attacks):

At will: light, resistance, sacred flame, toll the dead, word of radiance

3/day each: animate dead, bane, blindness/deafness, inflict wounds, ray of enfeeblement, ray of sickness, silence, spirit guardians, vampiric touch

1/day each: antilife shell, blight, cloudkill, contagion, create undead, death ward, guardian of faith

Control Undead (1/Day). The lich targets one undead creature it can see within 30 feet of it. The target must make a DC 14 Wisdom saving throw. On a failed save, the target must obey the lich's commands for the next 24 hours. An undead whose challenge rating is equal to or greater than 8 is immune to this effect.