As a draconic acolyte of the silver dragon goddess Tamara, you seek to emulate her careful balance of strength tempered with mercy. Her dracolytes are some of the kindest and most benevolent of clerics. But others should not conflate these traits with weakness. If they do, they typically will not survive to make that error twice.

Tamara's clerics were healers, but also deliverers of death to those who tried to escape it. They sought out to destroy undead across the lands, particularly draconic undead 

based off the Disciple of Tamara by Zukarlyn

Bonus Proficiency

When you choose this domain at 1st level, you gain proficiency martial weapons. A cleric of the Merciful Domain wields a scimitar as that is the goddess' favored weapon. Their Spiritual Weapon also appears as a golden glowing scimitar

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.

Immune to Frightful Presence

The Dracolyte of Tamara is treated as a dragon for purposes of being immune to the frightful presence of dragons or other similar creatures.

Disciple of Mercy

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 1 + the spell’s level.

Channel Divinity: Radiant Breath

Starting at 2nd level, you can use your Channel Divinity to harness radiant light, banishing darkness, and dealing radiant damage to your foes.

As an action, you present your holy symbol and a 30-foot cone of radiant light emanates from it, dispelling darkness in the affected area. Any hostile creature within this cone must make a Wisdom saving throw. A creature takes radiant damage equal to five times your cleric level on a failed saving throw, and half as much damage on a successful one. Undead creatures do not get a saving throw and take full damage. A creature that has total cover within the cone is not affected.

Merciful Healer

Beginning at 6th level, the healing spells you cast on others heal those nearby as well. When you cast a spell of 1st level or higher that restores hit points to a creature other than you, all creatures within 10 feet of that target regain hit points equal to 2 + the spell’s level.

Wyrmling Acolyte

At 8th level, you are entrusted with the care of a silver dragon wyrmling. The wyrmling follows the dracolyte loyally and will even accompany her on adventures (though the wyrmling gains no experience or levels)

Supreme Mercy

Starting at 17th level, when a creature you can see within 120 feet of you has their Hit Points reduced to zero, you can use your Reaction to grant them hit points equal to your Cleric level.