Corrupted Herald

Aura of Corruption. Hostile creatures that begin their turn within 5 feet of a cultist must succeed on a DC 13 WIS saving throw or have disadvantage on all attack rolls they make that turn and they have a -3 to their AC until they leave the aura. Once a creature succeeds against this they are immune for 24 hours.

Divine Conviction. All allies within 30 ft. have advantage on saving throws against being frightened or charmed.

Spellcasting. 
Corrupted Herald is a 5th level Spellcaster. Using CHA as Spellcasting ability. +6 to hit, Spell save DC 15. 

Cantrip: (At Will) Thaumaturgy Sacred Flame +3 (2d8)

2nd Level: (3/day)  Bless Command Healing Word (2d4+6) Hold Person

3rd Level: (1/day) Spirit Guardians [/rollable] (3d8)

Action. Either cast a spell with casting time of one action or unarmed strike

Unarmed Strike. Melee Weapon Attack:  1 bludgeoning damage.

Corruption Benediction. Choose one ally within 30 feet.

Until the start of the Herald's next turn:

• Advantage on attacks
• +1d6 psychic damage on weapon attacks

Shared Suffering. When an ally within 30 feet takes damage, reduce that damage by 10. The Herald takes the prevented damage instead.

Death Burst. When reduced to 0 HP, every creature within 10 feet must make a DC 13 WIS save.

Failure:

• 2d6 psychic damage
• Speed reduced by 10 feet until end of next turn.