Graveborn

Graveborn are Death-touched acolytes who sacrifice health to unleash devastating Dark Magic attacks and become the phantasmal Reaper of Bones, accompanied by their manic Demi-Reaper companion.
Devotees of Death, Graveborn draw strength from the pain and passing of others, growing in power as they send the souls of their enemies screaming into the void. Where most fear Death, the Graveborn revel in it, and have even made it an ally. Aided by a powerful and ancient demi-reaper bound to their service, the Graveborn knows that all power comes at a price paid in blood, whether it be that of their foes or their own. 

Level 3: Demi-Reaper Companion

The Graveborn is accompanied by a floating Demi-Reaper Companion that targets enemies at range and deals necrotic damage. if your demi-reaper dies you can spend 10HP as a free action to resummon the demi-reaper.

demi-Reaper

Medium Undead, neutral

Armor Class 13 + PB (natural armor)

Hit Points 10 + five times your cleric level (the demi-reaper has a number of Hit Dice [d10s] equal to your cleric level)

Speed 0 ft., fly 30 ft. (hover)

Saving Throws Dex +2 plus PB, Con +3 plus PB

Senses darkvision 60 ft., passive Perception 11

Languages understands the languages you speak

Challenge — Proficiency Bonus (PB) equals your bonus

Actions

Strike. Melee Weapon Attack: +2 plus PB to hit, reach 5 ft., one target. Hit: 1d8 plus PB bludgeoning, piercing, or slashing damage (your choice).

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Reactions. 

Hellish Blast. When the graveborn hits a target with a spell, The Demi Reaper will create a homing projectile dealing 1d10 of the Spell's elemental type (if any) and 1d10 Necrotic damage. This damage increases by 1d10 when the graveborn reachs levels 5 (2d10), 11 (3d10), and 17 (4d10).

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Empower Attack. When the graveborn or a companion hits a target with an attack, and the graveborn or companion is within 5 feet of the Demi-Reaper, the target takes double damage.

Level 3: Dire Sacrifice

As a action you may spend HP up to 1 left where you explode in a 20-foot-radius Sphere centered on yourself, Each creature in that Sphere must succeed on a Dexterity saving throw on a failed save they take as much damage as spent in Necrotic damage and gain the Poisoned Status or half as much damage on a successful one and are not poisoned. The range increases by 20 foot when you reach levels 5, 11 , and 17.

Level 3: Graveborn Domain Spells

Your connection to this divine domain ensures you always have certain spells ready. When you reach a Cleric level specified in the Graveborn Domain Spells table, you thereafter always have the listed spells prepared. These count as Cleric spells for you.

Cleric Level	Spell
3rd	false life, spare the dying, witch bolt
5th	blindness/deafness, enhance ability
9th	animate dead, lightning bolt
13th	blight, death ward
17th	antilife shell, raise dead

Level 6: Sanguine Sacrament

when you cast a spell and successfully hit a creature you can choose to regain 2D20 hit points and if you gain 15 or more hit points from this effect your Demi-Reaper Hellish Blast activates twice this turn, you can only use this effect ounce per long rest.

Level 17: Reaper of Bones

you can gather your strength and momentarily cheat death. If you are dropped to 0 hit points you transform into a form reflecting your strength called Reaper of Bones which enhances your combat abilities, You regain full HP, gain a second Demi-Reaper, gain advantage on all attack rolls and you gain the ghost Etherealness trait except you can still attack. you can't gain HP while in this form and every round after reaper of bones activates you loss 1D20 HP this goes up by 1D10 every round, When your reduced to 0 HP again you loss all effects of reaper of bones and become incapacitated for one round and regain 1D6 HP. You can only use reaper of bones once per long rest.