Shadow Domain

Highly inspired the shadow priest class from World of Warcraft and from the Shadow Domain (5e Subclass) on dandwiki.

The image is also not mine, you can find it on artstation on NUARE studio.

The Shadow Clerics of Ravenloft, deep within the Shadowfell, cannot hold back the tide of nightmare that spreads from the plane of shadows. While these clerics believes in the light and life, they know the greatest light casts the darkest shadows. Clerics of the shadow domain embrace this opposing polarity of light and darkness, but instead focus on fears and necrotic energies to overcome their foes and preserve life. 

Shadow Domain Spell

Cleric Level	Spells
1st	Healing Word, Dissonant Whispers
3rd	Darkness, Mind Spike
5th	Fear, Vampiric Touch
7th	Aura of Life, Phantasmal Killer
9th	Mass Cure Wounds, Synaptic Static

 

Bonus Proficiencies

When you choose this domain at 1st level, you gain proficiency in the Deception skill, and expertise with the Stealth skill.

Disciple of Life

Also starting at 1st level, your healing spells are more effective. Whenever you use a spell of 1st level or higher to restore hit points to a creature, the creature regains additional hit points equal to 2 + the spell’s level.

Channel Divinity: Shadow of Nightmare

Starting at 2nd level, you can use your Channel Divinity to harness the bridge between life and death, banishing light and dealing psychic damage to your foes.

As an action, you present your holy symbol, and any magical light within 30 feet of you is dispelled. Additionally, each hostile creature within 30 feet of you must make a Wisdom saving throw. A creature takes psychic damage equal to 2d10 + your cleric level 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.

Worst Nightmare

Beginning at 6th level, you gain a deeper understanding of people's worst nightmares. When you cast a spell which can cause frightening effect, you can impose disadvantage on that roll and any future roll to save the target from this spell's frightened effect. You can use this feature once per long rest. 

Shadowform

At 8th level, the cleric gains the ability to infuse himself with shadow energy. As a bonus action, shadow smoke emanates from the cleric's body that lasts until dispelled or until a healing spell is cast. When the cleric damages a creature while in this form, the damage source deals an extra 1d8 psychic damage to the target. When the cleric reaches 14th level, the extra damage increases to 2d8.

Channel Divinity: Vampiric Embrace

Starting at 17th level, you can use your Channel Divinity to summon the power of death to heal.

As an action, you can shroud you and your allies with a necrotic aura which damage and siphon life force from others. Whenever a shrouded target deals damage to a creature, add 2d6 necrotic damage and the shrouded target regain hit points equal to the necrotic damage dealt that way. This aura lasts for 1 minute or until canceled.