Renegade

Most clerics died because of the experience. But those who survived become renegade clerics. They are no longer ordinary clerics who part of temples and worship. They become outsiders to the temple because now they no longer have a deity to follow. Some of them look for a temple and deity to accept them. 

Bonus Proficiency

When you choose this domain at 1st level, you gain proficiency with heavy armor.

Vampiric Touch

You can take away the life force of your opponents to regain your own. 

improved vampiric touch

Starting at 2nd level, you can gain more life force

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 Strike

At 8th level, you gain the ability to infuse your weapon strikes with divine energy. Once on each of your turns when you hit a creature with a weapon attack, you can cause the attack to deal an extra 1d8 radiant damage to the target. When you reach 14th level, the extra damage increases to 2d8.

Supreme vampiric touch

Starting at 17th level, when you would normally roll one or more dice to use vampiric touch 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.