Cult Head Of Demogorgon

Spellcasting. The cult priest is a 20th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 16). It has the following cleric spells prepared:

Cantrips (at will): minor illusion, poison spray, toll the dead, thaumaturgy

1st level (4 slots): arms of Hadar, bane, command, inflict wounds, Tasha's hideous laughter

2nd level (3 slots): blindness/deafness, crown of madness, enthrall, hold person

3rd level (2 slots): bestow curse, dispel magic, fear, major image

4th level (3 slots): control water, confusion, Evard's black tentacles, guardian of faith

5th level (2 slots): contagion, dominate person, flame strike, telekinesis

6th level (1 slot): eyebite, harm, mass suggestion

7th level (2 slots): divine word, finger of death, symbol

8th level (1 slot): antimagic field, unholy aura

9th level (1 slot): gate, true resurrection

Multiattack. The cult head uses its Maddening Gaze. It then makes two melee attacks: one with its tentacle and one with its dagger. Alternatively, it can make one melee attack and cast one spell.

+1 Dagger. Melee or Ranged Weapon Attack: +8 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 6 (1d4 + 4) piercing damage, and the target must succeed on a DC 15 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.

Tentacle. Melee Weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage plus 9 (2d8) necrotic damage. If the target is a creature, it must succeed on a DC 15 Constitution saving throw or its hit point maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the target finishes a long rest. The target dies if its hit point maximum is reduced to 0.

Maddening Gaze (Recharges 4-6). The cult high priest fixes its gaze on one creature it can see within 30 feet of it. The target must succeed on DC 16 Wisdom saving throw. On a failed saving throw, roll 1d6. On a roll of 1-3, the target suffers the effect of the confusion spell without making a saving throw. On a roll of 4-6, the target is stunned. Either effect lasts until the start of the cult priest's next turn.