Paladin Oath of the Monster Slayer

At the completion of the Fungal Forest, the party will have reached 3rd Level, which means its time for them to choose their Archetypes/College/Swear the Oath. I'm pretty open and will allow anything from the PHB or Xanathar's Guide. 

Both Paladins in the party are being played a little off kilter. One has become, by default, the party's Archer. The other likes killing monsters. There are no Oaths that cover these scenarios for the Paladin class, so I'm hacking together a couple of kits using existing features from different classes. 

Why not a Divine Archer (Oath of the True Arrow) or a Dragonslayer? 

I did not write most of this, merely complied it from other class features. 

Art by Dawnweaver13

Oath of the Monster Slayer

Tenants of Monster Slaying

Courage

                Never fear to act.

By Any Means Necessary

My qualms can’t get in the way of exterminating chaotic beasts.

Restitution.

If beasts of chaos wreak havoc upon the world, it is because use I failed to stop them. I must help those harmed by their misdeeds.

MONSTER SLAYER SPELLS

3rd         Protection from Order and Chaos

5th         Zone of Truth

9th         Magic Circle

13^th         Banishment

15^th        Hold Monster

At 3^rd Level

Nature Skill

Add +2 to your Nature skill. You are now proficient if you were not before.

The Slayer’s Sense

At 3rd level, you gain the ability to peer at a creature and magically discern how best to hurt it. As an action, choose one creature you can see within 60 feet of you.

You immediately learn whether the creature has any damage immunities, resistances, or vulnerabilities and what they are. If the creature is hidden from divination magic, you sense that it has no damage immunities, resistances, or vulnerabilities.

You can use this feature a number of times equal to your Wisdom modifier (minimum of once). You regain all expended uses of it when you finish a long rest.

Eye for Weakness

Starting at 3rd level, you can focus your ire on one foe, increasing the harm you inflict on it. As a bonus action, you designate one creature you can see within 60 feet of you as the target of this feature. The first time each turn that you hit that target with a weapon attack, it takes an extra 1d6 damage from the weapon.

This benefit lasts until you finish a short or long rest. It ends early if you designate a different creature

At 7^th Level

Choose two of the following:

Colossus Slayer

Your tenacity can wear down the most potent foes. When you hit a Huge or Gigantic creature with weapon attack, the creature takes an extra ld8 damage if it's below its hit point maximum. Vou can deal this extra damage only once per turn.

Giant Killer

When a Large or larger creature within 5 feet of you hits or misses you with an attack, you can use your reaction to attack that creature immediately after its attack, provided that you can see the creature.

Horde Breaker

Once on each of your turns when you make a weapon attack, you can make another attack with the same weapon against a different creature that is within 5 feet of the original target and within range of your weapon.

Escape the Horde

Opportunity attacks against you are made with disadvantage.

Multi-Attack Defense

When a creature hits you with an attack, you gain a +4 bonus to AC against all subsequent attacks made by that creature for the rest of the turn.

Steel Will

Vou have advantage on saving throws against being frightened.

At 11th level

Choose One of the Following

Volley

Vou can use your action to make a ranged attack against any number of creatures within 10 feet of a point you can see within your weapon's range. Vou must have ammunition for each target, as normal, and you make a separate attack roll for each target.

Whirlwind Attack.

Vou can use your action to make a melee attack against any number of creatures within 5 feet of you, with a separate attack roIl for each target.

Magic Disruptor

You gain the ability to thwart someone else’s magic. When you see a creature casting a spell or teleporting within 60 feet of you, you can use your reaction to try to magically foil it. The creature must succeed on a Wisdom saving throw against your spell save DC, or its spell or teleport fails and is wasted.

Once you use this feature, you can’t use it again until you finish a short or long rest.

At 15th Level

Choose One of the Following

Evasion.

You can nimbly dodge out of the way of certain area effects, such as a red dragon's fiery breath or a lightning bolt spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail

Stand Against the Tide.

When a hostile creature misses you with a melee attack, you can use your reaction to force that creature to repeat the same attack against another creature (other than itself) of your choice.

Uncanny Dodge

When an attacker that you can see hits you with an attack, you can use your reaction to halve the attack's damage against you.

Slayer’s Counter

You gain the ability to counterattack when your prey tries to sabotage you. If the target of your Eye for Weakness forces you to make a saving throw, you can use your reaction to make one weapon attack against the quarry. You make this attack immediately before making the saving throw. If your attack hits, your save automatically succeeds, in addition to the attack’s normal effects.