Oath of Warcaft

Tries to mimic what a paladin from World of Warcaft would do.

Adds Judgement as a Channel Divinity - lvl 3

Adds Seals mechanics - lvl 3

You choose your Aura to specialize yourself - lvl 7

Adds Blessing mechanics - lvl 15

Divine Intervention - lvl 20

Channel Divinity

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

Judgement. As a bonus action, choose a creature that you can see within 30 feet of you. Whenever the chosen creature takes damage from any source, you may choose to gain half that damage as Temporary Hit Points until it dies. Don't forget, Temporary Hit Points don't stack. You can use this feature a number of times equal to your Proficiency Bonus per Short Rest.

Seals

Until next dawn, you make a prayer to one of your seals and gain its benfits. You can only have one seal active at a time.

Seal of Light

Whenever you use your Lay on Hand feature, each point spent count as two. 

Ex. I use 3 points, so I heal for 6 Health Points.

Seal of Righteoussness

Whenever you hit a creature with a weapon attack, you can add your Paladin level to the damage roll as Radiant damage.

Seal of the Crusader

While you are wielding a shield, you can use the Two Weapon Fighting feature if your weapon is light. Your second attack is still with your main weapon, but don't forget, you don’t add your ability modifier to the damage of the bonus attack, unless that modifier is negative.

Seal of Wisdom

Whenever you succeed a Saving Throw, regain a Spell Slot level 1.

Specialization Aura

Starting at 7th level, you must choose a path of how you manifest your holiness.

At 18th level, the range of auras are increased to 30 feet.

Concentration Aura

Your smites no longer need concentration.

Crusader Aura

You and allies within 10 feet of you no longer provoke opportunity attacks while you are conscious.

Devotion Aura

While you are wielding a shield, you gain +3 to Armor Class and allies within 10 feet of you gain +1 to their Armor Class while you are conscious. 

Retribution Aura

When you take damage from a creature that is within 10 feet of you, you may deal your Paladin level as Radiant damage to that creature while you are conscious.

Blessings

Beginning at 15th level, you can now cast blessings on yourself and allies.

Divine Intervention

At 20th level, as a reaction, you sacrifice yourself to remove up to 3 targeted party members other than yourself from harms way. The protected party members are immune to all damage but cannot take any actions for 1 minute.

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