Oath of the Spelldrinker.

The Oath of the Spelldrinker is devoted to ridding the world of renegade mages, such as liches or the occult, in order to protect the helpless from the forces of evil magic. The paladins who swear this oath believe in maintaining the balance of power between the ordinary and the extraordinary, including themselves. These paladins are resourceful and quick to remember their own mortality and privilege, often choosing to pursue mundane solutions before magical ones. Despite their caution, these wardens of balance are exemplary arcanists who can feel the weave of magic in the world as keenly as some of the finest sorcerers.

Level 1 Features:

Tenants of the Spelldrinker.

The tenets of the Oath of the Spelldrinker were written and passed down by cautious guardians set to rid the world of evil mages. They emphasize balance within oneself through the following tenets:
Be the Sword. Be a stalwart champion of fairness and equality among all. The sword doesn't cheat fate: it dances with it.
Be the Shield. Defend the innocent against the forces of rampant magic. The shield is patient and unwavering in the face of the unknown.
Be the Spell. Use your power to provide balance and guidance. The spell can lead to prosperity as easily as it can to ruin: you must always choose the righteous path.

Level 3 Feature:

Oath Spells.

Each oath has a list of associated spells. You gain access to these spells at the levels specified in the oath description. Once you gain access to an oath spell, you always have it prepared. Oath spells don't count against the number of spells you can prepare each day.
If you gain an oath spell that doesn't appear on the paladin spell list, the spell is nonetheless a paladin spell for you.

Channel Divinity: Absorb Magic.

You can refute certain spells and use them to nourish yourself. Using your Channel Divinity, you can interrupt a creature you can see within 30 feet of you casting a spell. You can use a reaction when you see a creature within range casting a spell to present your holy symbol and interrupt it. The spell fails and has no effect if it is of a level no higher than 1 + your paladin level divided by 3 (rounded up), to a maximum of 6th-level spells. When it does, you gain a number of temporary hit points equal to your Charisma modifier, plus 5 times the spell's level.

Channel Divinity: Expeditious Command.

You can use your Channel Divinity to issue a word of power and release a wave of invigorating energy from your holy symbol. As a bonus action, choose a number of creatures within 30 feet of you up to your Charisma modifier (minimum one creature). Until the start of your next turn, the chosen creatures can use a bonus action to take either Dash or Disengage action. As part of using your Channel Divinity in this way, you can also take either the Dash or Disengage action.

Level 7 Feature:

Aura of Disruption.

Beginning at 7th level, the arcane energy that hangs around you is volatile to enemy spellcasters. Whenever a hostile creature ends its turn within 10 feet of you while concentrating on a spell, it must succeed on a Constitution saving throw against your paladin spell save DC or lose concentration on the spell. In addition, you and friendly creatures within 10 feet of you can't be perceived through magical scrying sensors.
At 18th level, the range of this aura increases to 30 feet.

Level 15 Feature:

Armoured Focus.

Starting at 15th level, while you are concentrating on a paladin spell, your concentration can't be broken as a result of taking damage.

Level 20 Feature:

Arcane Conduit.

At 20th level, as an action, you can emanate a field of crackling magic in a 30-foot radius. For 1 minute, you gain the following benefits:
-You have resistance to damage from spells and have advantage on saving throws against spells.
-Whenever a creature hits you with a melee attack, that creature takes force damage equal to your Charisma modifier (minimum of 1) as magical energy lashes out at them.
-When you expend a spell slot of 1st level or higher, friendly creatures in the field regain a number of hit points equal to your Charisma modifier (minimum of 1), while hostile ones take force damage equal to the same amount instead.
Once you use this feature, you can't use it again until you finish a long rest.