Cultist leader

Dark Devotion. The fanatic has advantage on saving throws against being charmed or frightened.

Spellcasting. The fanatic is a 15th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 17, +4 to hit with spell attacks). The fanatic has the following cleric spells prepared:

Cantrips (at will): light, sacred flame, thaumaturgy, Resistance, Guidance

1st level (4 slots): command, inflict wounds, shield of faith, sanctuary

2nd level (4 slots): hold person, spiritual weapon, Blindness/Deafness, Enhance Ability

3rd level (3 slots): animate Dead, Bestow Curse, Spirit Guardians

4th level (3 slots):Guardian of Faith, Banishment, Stone Shape

5th level (2 slot): Raise Dead, Flame Strike

6th level (1 slot): Heal

7th level (1slot): Divine Word

8th level (1 slot): Holy Aura

Multiattack. The fanatic makes two melee attacks and a spell attack

Dagger. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one creature. Hit: 4 (1d4 + 2) piercing damage.

The cult leader 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 aboleth regains spent legendary actions at the start of its turn.

Cast a cantrip: the cult leader cast a cantrip

Attack: the cult leader uses his dagger