Oath of the Fortress

You are a wall, a castle, armor, and a garrison all at once. 

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.

Level     Spells
3rd            Shield, Shield of Faith
5th            Misty Step, Warding Bond
9th            Thunder Step, Wind Wall
13th          Fire Shield, Wall of Fire
17th          Wall of Force, Wall of Stone

Channel Divinity

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

Cover Move: As a reaction you may instantly interpose yourself between an ally within 30ft of you and an enemy. If you use this ability after a ranged attack is made, you either: take the damage if the attack roll would hit your AC, or deflect the attack if the attack roll would miss your AC. If a creature one size larger than you or smaller is in a space adjacent to your ally, you must succeed a contested Str (Athletics) check to move them back 5ft if able. If you fail, the creature is two or more sizes larger than you, or the creature cannot move because of an obstruction: a willing ally may be moved 5ft back instead. If the ally is unwilling or unable to move (such as by a hold person spell / they are restrained / or there is an obstruction) you instead land in the nearest unoccupied space. If you use this ability after a melee attack is made and are between the attacker and your ally, you either: take the damage if the attack roll would hit your AC, or deflect the attack if the attack roll would miss your AC. If you use this ability after a melee attack is made and are NOT between the attacker and your ally, you add +5 to your allies AC for that one attack.

Benevolent Knight: As an action you can Channel Divinity to gain the effects of Benevolent Knight for up to 1 minute (requiring concentration). While under the effects of Benevolent Knight you gain temporary HP equal to half your AC at the start of each of your turns (does not stack, the new amount replaces any remaining temporary HP unless the new amount is less). Also, once per turn, if you take any damage beyond your temporary HP you gain +1 to AC (MAX +5) until Benevolent Knight ends.

Loving Sacrifice

Starting at 7th level, you can use an action to generate an aura 10ft in diameter centered on you, and moving as you move. While within your aura, friendly creatures have your AC, resistance to physical damage (bludgeoning, piercing, and slashing), and any physical damage they would take is instead taken by you.

At 18th level, the range of this aura increases to 20ft, and the resistance and damage conversion includes all types of damage.

You can use this feature a number of times equal to your Proficiency Bonus. You regain all expended uses when you finish a long rest.

 

Stout Guardian

Starting at 7th level, when you are reduced to 0 Hit Points but not killed outright, you can drop to 1 hit point instead. You can’t use this feature again until you finish a Long Rest.

Defensive Movement

Beginning at 15th level, you can nimbly dodge out of the way of certain area Effects, such as a red dragon's fiery breath or an Ice Storm 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.

You also gain the ability to add your full Dexterity modifier to your AC even if you are wearing medium or heavy armor.

Aegis

At 20th level you can use an action to create a 10ft radius dome of light centered on yourself, which lasts until the start of your next turn. Any creature you choose within the dome is immune to all damage.

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