Arch Priest of Sculk

Undead Fortitude. If damage reduces the priest to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the priest drops to 1 hit point instead.

Spellcasting. The arch priest is an 20th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 18, +10 to hit with spell attacks). The arch priest has the following wizard spells prepared:

Cantrips (at will): Chill Touch, Poison Spray, Toll the Dead, Message.

1st level (4 slots): Cause Fear, Disguise Self, Ray of Sickness, Sleep.

2nd level (3 slots): Acid Arrow, Crown of Madness, Detect Thoughts.

3rd level (3 slots): Animate Dead, Bestow Curse, Fear.

4th level (3 slots): Blight, Confusion, Hallucinatory Terrain.

5th level (3 slots): Cloudkill, Contact Other Plane, Danse Macabre.

6th level (2 slots): Circle of Death, Contingency.

7th level (2 slots): Finger of Death, Mirage Arcane.

8th level (1 slots): Dominate Monster

9th level (1 slots): Power Word Kill.

Touch of Death. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 5 (2d4+2) necrotic damage.