Black Sun Priest (corrected)

Devil's Sight. vision is not impeded by magical darkness

Resist The Divine: The Priest gains advantage when saving to resist effects made using the Channel Divinity power. 

Channel Divinity. A Black Sun Priest has 2 uses of their channel per short/long rest.

Touch of Death. When you hit a creature with a melee attack, you can use Channel Divinity to deal extra necrotic damage to the target. The damage equals 17.

Radiance of the Eclipse. As an action, you present your unholy symbol, and any magical light within 30 feet of you is dispelled. Additionally, each hostile creature within 30 feet of you must make a Constitution saving throw. A creature takes necrotic damage equal to 2d10 + 6 on a failed saving throw, and half as much damage on a successful one. A creature that has total cover from you is not affected.

Spellcasting. The [Black Sun Priest is a 6th level spellcaster. Its spellcasting ability is Wisdom (spell save DC 13, +5 to hit with spell attacks). The Black Sun Priest has following spells prepared:
Cantrips (at will): chill touch, thaumaturgy, toll the dead (5th lvl), sacred flame (necrotic)

1st level (4 slots): bane, command, sanctuary, shield of faith

2nd level (3 slots): darkness, blindness/deafness, silence

3rd level (3 slots): bestow curse, spirit guardians, vampiric touch

Actions. The priest may use one of its abilities below as an action.

Black Sun Staff. Magical Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 5 (1d6 + 2) bludgeoning damage + 7 (2d6) necrotic damage.

Divine Darkness (Recharge 5-6). As an action with the staff, the Priest can cast one of the following spells without using a spell slot: darkness, animate dead, dispel magic