Knight of the Black Sword

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

When the cultist dies, its corpse freezes for 9 days, during which time it can't be thawed, harmed by fire, animated, or raised from the dead.

The fanatic is a 4th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 11, +3 to hit with spell attacks). The fanatic has the following cleric spells prepared:

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

Level 1 (4 slots): command, inflict wounds, shield of faith

Level 2 (3 slots): hold person, spiritual weapon

The fanatic makes two melee attacks.

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