Death Domain.

The Death domain is concerned with the forces that cause death, as well as the negative energy that gives rise to undead creatures. Gods of the Death domain also embody murder and the underworld.

Level 1 Features:

Death 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.

Bonus Proficiencies.

When the cleric chooses this domain at 1st level, they gain proficiency with martial weapons

Reaper.

At 1st level, the cleric learns one necromancy cantrip of his or her choice from any spell list. When the cleric casts a necromancy cantrip that normally targets only one creature, the spell can instead target two creatures within range and within 5 feet of each other.

Level 2 Feature:

Channel Divinity: Touch of Death.

Starting at 2nd level, the cleric can use Channel Divinity to destroy another creature's life force by touch.
When the cleric hits a creature with a melee attack, the cleric can use Channel Divinity to deal extra necrotic damage to the target. The damage equals 5 + twice his or her cleric level.

Level 6 Feature:

Inescapable Destruction.

Starting at 6th level, the cleric's ability to channel negative energy becomes more potent. Necrotic damage dealt by the character's cleric spells and Channel Divinity options ignores resistance to necrotic damage.

Level 8 Feature:

Divine Strike.

At 8th level, the cleric gains the ability to infuse his or her weapon strikes with necrotic energy. Once on each of the cleric's turns when he or she hits a creature with a weapon attack, the cleric can cause the attack to deal an extra 1d8 necrotic damage to the target.

Level 17 Feature:

Improved Reaper.

Starting at 17th level, when the cleric casts a Necromancy spell of 1st through 5th-level that targets only one creature, the spell can instead target two creatures within range and within 5 feet of each other. If the spell consumes its material components, the cleric must provide them for each target.