Damned Devotion. The fanatic has advantage on saving throws against being charmed, frightened, knocked prone.

Multiattack. The fanatic makes two melee attacks and casts one of its "at will" spells.

+1 Quarterstaff. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. Hit: 6 (1d6 + 3) bludgeoning damage, or 7 (1d8 + 3) bludgeoning damage if used with two hands, plus 5 (1d10) necrotic damage.

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

Spellcasting. The fanatic's spellcasting ability is Wisdom (spell save DC 14, +5 to hit with spell attacks). The acolyte has the following cleric and warlock spells prepared:

At will: light, eldritch blast, thaumaturgy

4/day: command, inflict wounds, shield of faith

3/day: hold person, darkness, mirror image

2/day: bestow curse

Enlarge (2/Short or Long Rest). The acolyte casts enlarge/reduce on itself, choosing the Enlarge option, requiring the blood of three live humanoids as material components instead of anything else. While cast in this way, the spell does not require concentration and lasts for 2 minutes.

Staff Slam (Enlarged Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft. Hit: 9 (1d8 + 1d4 + 3) bludgeoning damage, plus 6 (1d12) necrotic damage and the target must succeed on a DC 14 Strength saving throw or be knocked backward 5 feet.