Banelich

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

Rejuvenation. If it has a phylactery, a destroyed lich gains a new body in 1d10 days, regaining all its hit points and becoming active again. The new body appears within 5 feet of the phylactery.

Spellcasting. The lich is a 17th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 19, +11 to hit with spell attacks). It has the following cleric spells prepared:

Cantrips (at will): guidance, mending, sacred flame, thaumaturgy, toll the dead

1st level (4 slots): bane, command

2nd level (3 slots): augury, hold person, zone of truth

3rd level (3 slots): bestow curse, dispel magic, spirit guardians

4th level (3 slots): banishment, guardian of faith, freedom of movement

5th level (2 slots): contagion, dispel evil and good, flame strike

6th level (1 slot): blade barrier, harm

7th level (1 slot): divine word, fire storm

8th level (1 slot): antimagic field

9th level (1 slot): gate

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

Multiattack. The lich makes two coldfire attacks.

Paralyzing Touch. Melee Spell Attack: +11 to hit, reach 5 ft., one creature. Hit: 10 (3d6) cold damage. The target must succeed on a DC 17 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.

Coldfire. Ranged Spell Attack: +11 to hit, range 60 ft., one target. Hit: 10 (3d6) cold damage plus 10 (3d6) necrotic damage.

Grasp of Death (1/Day). Melee Spell Attack: +11 to hit, reach 5 ft., one creature. Hit: The target must succeed on a DC 17 Constitution saving throw or its hit points drop to 0. On a success, a creature takes 21 (6d6) psychic damage.

The lich can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The lich regains spent legendary actions at the start of its turn.

Cantrip. The lich casts a cantrip.

Coldfire. The lich uses its Coldfire.

Paralyzing Touch (Costs 2 Actions). The lich uses its Paralyzing Touch.

Painwrack (Costs 2 Actions). The lich fixes its gaze on one creature it can see within 10 feet of it. The target must succeed on a DC 17 Wisdom saving throw against this magic or take 16 (3d10) psychic damage and be stunned for 1 minute. The stunned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. On a successful save, the target takes half as much damage and isn't stunned. If a target's saving throw is successful or the effect ends for it, the target is immune to the lich's gaze for the next 24 hours.

Disrupt Life (Costs 3 Actions). Each non-undead creature within 20 feet of the lich must make a DC 17 Constitution saving throw against this magic, taking 21 (6d6) necrotic damage on a failed save, or half as much damage on a successful one.