Cleric of Vecna

Aura of Dread. Any creature of the Cleric’s choice that starts its turn within 10 feet must succeed on a DC 15 Wisdom saving throw or be Frightened until the start of its next turn. A creature that succeeds is immune to this effect for 24 hours.

Magic Resistance. The Cleric has Advantage on saving throws against spells and other magical effects.

Undead Fortitude. When reduced to 0 HP, the Cleric can make a DC 15 Constitution saving throw. On a success, it drops to 1 HP and regains 30 hit points.

Vecna’s Touch of Undeath. The Cleric is immune to necrotic damage. When it takes necrotic damage, it instead regains hit points equal to the damage it would have taken.

Multiattack. In any combination, the Cleric makes two attacks, either its Necrotic Ray or Unholy Touch. 

Necrotic Ray. Ranged Spell Attack: +7 to hit, range 120 ft., one target. Hit: 20 (4d8) necrotic damage, and has the Poisoned condition for 1 minute, repeating a DC 15 Constitution saving throw at the end of its next turn. Until the creature is no longer Poisoned or has Greater Restoration or a healing spell of 6th level or higher cast on them, they take an additional 9 (2d8) Necrotic damage at the start of their turn. 

Unholy Touch. Melee Spell Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (3d6 + 4) necrotic damage. The target can’t regain hit points until the end of its next turn.

Spellcasting. The Cleric of Vecna's spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks), casting the following spells prepared:

• At Will: Chill Touch, Command, Toll The Dead
  
• 2/Day Each: Animate Dead, Bestow Curse, Blindness/Deafness
  
• 1/Day Each: Greater Invisibility, Harm