Preservation Domain

These Clerics have sworn an oath not to do any harm. They cannot use the Attack action, instead gaining the Protect action. They cannot cast spells that cause damage, nor inflict conditions that could cause harm. 

Learning of Oghma.

Grants access to the Cantrips Prestidigitation and Druidcraft. 
Protect: You expend your action to protect an ally, raising your shield around them and redirecting all attacks made against them to you until your next turn.
Grants proficiency in Heavy Armor.

Channel Divinity: Radiant Aura

Starting at 2nd level, you can use your Channel Divinity to heal the badly injured.

As a bonus action, you call out to Oghma and evoke healing energy that can restore a number of hit points equal to your cleric level +1 divided by 2. You can’t use this feature on an undead or a construct.

Blessed Healer

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

Divine Protection

Whilst raising your shield in the Protect action attacks from directly in front of you have disadvantage. Once per long rest you can use a bonus action to channel your concentration. For one hour any critical hit against you becomes a normal hit. 

Supreme Healing

Starting at 17th level, when you would normally roll one or more dice to restore hit points with a spell, you instead use the highest number possible for each die. For example, instead of restoring 2d6 hit points to a creature, you restore 12.