Cultist Of the Serpent

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

Variant Cleric.  One of the three is a Cleric of the 5th level. down below is the spell they  have.
Spellcasting. The Cleric Cultist  is a 5-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 13, +5 to hit with spell attacks). The The Cleric Cultist has following Cleric spells prepared:
Cantrips (at will): [Infestation], [Poison spray], [lLght] 
1st level (4 slots): [Shield], [Cure wounds]
2nd level (3 slots): [Aid], [Hold Person]
3rd level (2 slots): [Bestow Curse], [Life Transference]

Poisonous Short sword. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 4 (1d6 + 2) slashing damage plus 7 (2d6) poison damage.

Poisonous blow Dart. Range Weapon Attack: +5 to hit, range 20/60., one creature. Hit: 4 (1d4 + 2) slashing damage plus 3 (1d6) poison damage.