Oracle Domain

The Oracle Cleric is a focused healer for those around them, willing to sacrifice their own health to help others. 

Godless

Your magical power comes from a connection with a powerful Fey, instead of any specific Deity 

Extra Health

When you choose this domain at 1st level, your hit die becomes a D10

Oracle Curse

Your eyes are obscured, making it difficult for you to see. You cannot see anything beyond 30 feet, but you can see as if you had darkvision. At 5th level, this distance increases to 60 feet. At 10th level, you gain blindsense out to a range of 30 feet. At 15th level, you gain blindsight out to a range of 15 feet.

Gift of Life

Also starting at 1st level, you can sacrifice health to make healing spells are more effective. Whenever you use a spell or ability to restore HP,  you can sacrifice HP to grant the creature the HP sacrificed, to a maximum of 2 x your cleric level 

Channel Divinity: Life Link

Starting at 2nd level, you can use your Channel Divinity to take damage for others to preserve their life. As an action, you may create a bond between yourself and a number of creatures up to your spellcasting modifier. Each round at the start of your turn, if the bonded creature is wounded for 5 or more hit points below its maximum hit points, it heals 5 hit points and you take 5 hit points of damage. This bond continues until the bonded creature dies, you die, the distance between you and the other creature exceeds 100ft, or you end it as an immediate action. The healing can be amplified by the Gift of Life. 

Self Preservation

Beginning at 6th level, you are better at keeping yourself alive. Whenever you are affected by a healing spell, including your own, you regain the maximum amount of healing possible.

Living Retribution

At 8th level, When a a creature that you are linked to via life link is damaged by another creature, as a reaction, you can half the damage. The attacker must make a Con save with a DC = 10 + Cha + Proficiency Bonus. On a failure the attacker takes half the damage of the original attack. On a success the Oracle Cleric instead takes half the damage of the original attack and is fatigued till the end of their next turn.

You can use this ability an amount of time equal to 1/4 your cleric level between short or long rests.

This functions instead of the usual effect of Life Link.

Ultimate Sacrifice

Starting at 17th level, you can save others from death by putting yourself on the verge of death instead. When a creature that you are linked to via life link drops below 0 HP, as a reaction you can swap your current HP for theirs, dropping you below 0 HP. Their HP's cannot exceed their HP maximum through this method. Additionally the healed creature gains resistance to the damage type that reduced them to 0 HP for 1 minute.