Inescapable Destruction. Necrotic damage dealt by the Death Priest ignores resistance. 

Spellcasting. The priest is a 9th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 15, +7 to hit with spell attacks). It has the following cleric spells prepared:

Cantrips (at will): toll the dead, mending, resistance, word of radiance

1st level (4 slots): false life, inflict wounds, healing word, ray of sickness

2nd level (3 slots): blindness/deafness, hold person, ray of enfeeblement, silence, spiritual weapon

3rd level (3 slots): animate dead, bestow curse, dispel magic, protection from energy, spirit guardians, vampiric touch

4th level (3 slots): blight, death ward, freedom of movement, guardian of faith

5th level (1 slot): antilife shell, contagion, insect plague

Warhammer. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage plus 4 (1d8) necrotic damage. 

Reaper. The Death Priest can cast Toll the Dead targeting two creatures within range that are within 5 feet of each other. 

Touch of Death (recharge 5-6). The Death Cleric makes a warhammer attack. If the attack hits, it does an additional 23 necrotic damage.