Exorcist

After many encounters with the undead, you have decided to specialize in fighting them. You learned to perform an exorcism to free possessed people.

Level 3: Saving the possessed

Whenever a possessed person gets to 0 hit points while being up to 30ft around you, the ghost leaves the body of the possessed and you heal the person for 1d4 + your character level

Level 3: Exorcism

You can now perform an exorcism on an immobile being.

 

Later, you will master this ability.

Level 3: Spiritual Barrier

As an action you can summon a Spiritual Barrier in form of a sphere around you once per long rest. This barrier doesn't affect anything except undead. Undead monsters cant pass this barrier unless they succeed a constitution saving throw. If a possessed creature passes the area and the ghost fails a saving throw, the ghost stays back while the person goes through the barrier

Level 6: Zombiehunter

When an undead hits you with a melee attack, they take 1d4+25% of the damage they dealt to you of damage.

You also gained more experience in fighting undead

Level 17: Aura against hell and the dead

Every Exorcist ability is now also including fiend monsters.

The barrier also blocks fiend monsters and fiend Monster also take damage when hitting you with a melee attack 

Now you always succeed an exorcism if the possessed person is immobile and can also cast it on not immobile creatures