Grave Domain.

Gods of the grave watch over the line between life and death. To these deities, death and the afterlife are a foundational part of the multiverse. To desecrate the peace of the dead is an abomination. Followers of these deities seek to put wandering spirits to rest, destroy the undead, and ease the suffering of the dying. Their magic also allows them to stave off death for a time, particularly for a person who still has some great work to accomplish in the world. This is a delay of death, not a denial of it, for death will eventually get its due.

Level 1 Features:

Grave Domain Spells.

Each domain has a list of spells—its domain spells—that you gain at the cleric levels noted in the domain description. Once you gain a domain spell, you always have it prepared, and it doesn't count against the number of spells you can prepare each day.
If you have a domain spell that doesn't appear on the cleric spell list, the spell is nonetheless a cleric spell for you.

Circle of Mortality.

At 1st level, you gain the ability to manipulate the line between life and death. When you would normally roll one or more dice to restore hit points with a spell to a creature at 0 hit points, you instead use the highest number possible for each die.
In addition, you learn the Spare the Dying cantrip, which doesn't count against the number of cleric cantrips you know. For you, it has a range of 30 feet, and you can cast it as a bonus action.

Eyes of the Grave.

At 1st level, you gain the ability to occasionally sense the presence of the undead, whose existence is an insult to the natural cycle of life. As an action, you can open your awareness to magically detect undead. Until the end of your next turn, you know the location of any undead within 60 feet of you that isn't behind total cover and that isn't protected from divination magic. This sense doesn't tell you anything about a creature's capabilities or identity.
You can use this feature a number of times equal to your Intelligence, Wisdom or Charisma modifier (minimum of once). You regain all expended uses when you finish a long rest.

Level 2 Feature:

Channel Divinity: Path to the Grave.

Starting at 2nd level, you can use your Channel Divinity to mark another creature's life force for termination.
As an action, you choose one creature you can see within 30 feet of you, cursing it until the end of your next turn. The next time you or an ally of yours hits the cursed creature with an attack, the creature has vulnerability to all of that attack's damage, and then the curse ends.

Level 6 Feature:

Sentinel at Death's Door.

At 6th level, you gain the ability to impede death's progress. As a reaction when you or a creature you can see within 30 feet of you suffers a critical hit, you can turn that hit into a normal hit. Any effects triggered by a critical hit are cancelled.
You can use this feature a number of times equal to your Intelligence, Wisdom or Charisma modifier (minimum of once). You regain all expended uses when you finish a long rest.

Level 8 Feature:

Potent Spellcasting.

Starting at 8th level, you add your Intelligence, Wisdom or Charisma modifier to the damage you deal with any cleric cantrip.

Level 17 Feature:

Keeper of Souls.

Starting at 17th level, you can seize a trace of vitality from a parting soul and use it to heal the living. When an enemy you can see dies within 60 feet of you, you or one creature of your choice that is within 60 feet of you regains hit points equal to the enemy's number of Hit Dice. You can use this feature only if you aren't incapacitated. Once you use it, you can't do so again until the start of your next turn.