Oath of the Valkyrie

The Oath of the Valkyrie brings the Paladin to be the shepherd of your soldiers and the wolf for your foes. It binds you to the battlefields to hone your skills for the Last Battle. You are here to protect those that needs it, and guide the braves by your presence and your actions. Many of those Paladins are presented with this oath by their god because of their action rather than their believes and once they are chosen they take great pride in their duty.

 

To Guide - You are to be a beacon for your kind and the hopeless. 

To Protect  - You are to make everything possible to ensure those of less power than you stay safe around you.

To be Prepared - The Last Battle can explode at anytime. You have to be prepared and dedicate your life to always better yourself for it.

Channel Divinity

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

Battle Cry. As bonus action, you can shout a battle cry to empower your allies. Each creature of your choice (including you) within 30 feet of you that can hear you can add your Charisma modifier (minimum of 1) to it's next attack roll. The attack does additional radiant damage equal to your Charisma modifier (minimum of 1).

The effect last for 10 minutes if no attack is made after the Battle Cry.

Shaking Roar. When an ally is being attacked by a creature within 30 feet of you, you can use your reaction to shout at the enemy shaking them. If the enemy creature can hear you, it gets disadvantage on his attacks for the round and the first time it hits the ally that triggered the reaction it suffers 1d6 + your Charisma modifier (minimum of 1) thunder damage. 

Oath Spells

You gain oath spells at the paladin levels listed.

Oath of the Valkyrie Spells

To fit more in the aesthetic I wanted for this class you could replace the following spells :

Unseen Servant by Zephyr Strike

Beacon of Hope by Conjure Barrage

Remove Curse by Thunder Step

Legend Lore by Destructive Wave 

Aura of Resilience

Starting at 7th level, friendly creatures (including you) within 10 feet of you  gain advantage on the first saving throw from a spell or effect that would render you charmed, poisoned, paralyzed, frightened, petrified, stunned or put you to sleep.

At 18th level, the range of this aura increases to 30 feet.

Endurance

Starting at 15th level, when you would fall to 0 hit points, your will to fight is empowered by your god and you come back to half your hit points.

After 1 minute if your still alive you suffer 1 level of exhaustion.

Once you've used this feature you can't do so again until you've completed a long rest.

Battle Angel

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

Wings sprout from your back and grant you a flying speed of 60 feet.

You emanate a provoking aura in a 30-foot radius. The first time any enemy creature enters the aura or starts its turn there during a battle, the creature must succeed on a Wisdom saving throw or be affected by the spell compelled duel. 
Additionally while in this form you can attack any creature without breaking the compelled duel spell and you gain resistance against bludgeoning, piercing and slashing damage dealt by the creatures affected by this effect.