Oath of Quarantine

Oath of Quarantine Paladins main purview is the cleansing of battlefields and aiding of souls to their afterlife. They are the bane of undead and the unsung heroes of war. As such, paladins that take this oath often follow The Raven Queen, however, this is by coincidence and not a requirement. 

Tenets:

Halt the Spread: The aftermaths of war shall not spread under my watchful eye.

Cure the Afflicted: My duty is to those affected by war. To heal, to prevent, to counsel. 

Atone for the Dead: At the end of the day, I always pray to their local gods that their soul makes it home safely.

Oath of Quarantine Spells:
3rd: Identify, Protection from Evil and Good
5th: Knock, Gentle Repose
9th: Speak With Dead, Mass Healing Word
13th: Fabricate, Guardian of Faith
17th: Antilife Shell, Cloudkill

Channel Divinity

When you take this oath at 3rd level, you gain the following two Channel Divinity options:

Vow of Extermination: As an action, you can use your channel divinity to utter a Vow of Extermination against one of the following: undead, celestial, or fiendish creatures. You gain advantage on attack rolls against the chosen creature type for 1 minute.

Divine Pull: As an action, you can use your channel divinity to create something akin to a magnetic pull between you and another creature. When a creature attempts to move away from you, it must make a constitution save or take 1d4 damage for every 10 feet away from you it attempts to move. On a successful save, the effect ends. This effect can only be used on any one creature once per encounter.

Undead Sense

At 3rd level, you learn to sense undead with your divine sense.

Relentless Avenger

By 7th level, your supernatural focus helps you close off a foe's retreat. When you hit a creature with an opportunity attack, you can move up to half your speed immediately after the attack and as part of the same reaction. This movement doesn't provoke opportunity attacks.

Deadly Ultimatum

Starting at 15th level, when you are reduced to 0 hit points and are not killed outright, you can choose one enemy within 20 feet, you cannot go unconscious until they do. However, in this state, you cannot be healed by any means and if the damage you take in this state is equal to or exceeds your health point maximum, you die.

Avatar of Quarantine

At 20th level, you assume the form of an Avatar of Quarantine. Using your action, you undergo a transformation. For 1 hour, you gain the following benefits:

You can choose 2d4 creatures you can see within 20 feet, the creatures you choose are all affected by your divine pull.

Whenever a creature hits you with an attack, it takes radiant damage equal to half the damage you take from an attack.