Cult Fanatic of Mephistopheles

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

Spellcasting. 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, fire bolt

1st level (4 slots): command, inflict wounds, burning hands

2nd level (3 slots): flaming sphere, spiritual weapon

Mephistopheles’s cultists can gain the Spell Shield trait. Cult leaders can also gain the Spell Leech trait.

Spell Shield. This creature gains advantage on saving throws against spells. If it succeeds on such a saving throw, it gains temporary hit points equal to the spell’s level.

Spell Leech. As a bonus action, this creature chooses one ally it can see within 30 feet of it. The target loses its lowest-level spell slot, and this creature gains it.

Multiattack. The fanatic makes two melee attacks.

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.