Oath of the Guardian

The Oath of the Guardian binds the Paladin that takes it to protect those around them to the best of their capabilities.

Channel Divinity

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

Spectral Fortress You can create a wall that encases the area within 5 ft of you that no creature can pass through, AoE attacks still go through the wall. The wall is see-through, 15 ft high and has a 12 AC. The Wall has twice your paladin level as hitpoints. You have full cover while behind that wall. You can use your Bonus Action to drop the wall early.

Body of Steel You use your divine power to strengthen someone within 15 ft.   Until the end of their next turn, they have resistance against nonmagical damage and have a +3 to their AC.

Spellcasting

Paladin Level	Spells
3rd	armor of Agathys, shield
5th	lesser restoration, warding bond
9th	leomunds tiny hut, beacon of hope
13th	death ward, stoneskin
17th	mass cure wounds, dominate person

Aura of Fortitude

Starting at 7th level, you constantly emanate a calming aura that grants increased resilience. While within 10 ft of you your allies gain a +1 bonus to ac and gain Immunity to the effects of the Frightened condition.
At 18th level, the range increases to 30 ft.

Defenders Crest

Starting at 15th level, you can touch one creature within 5 ft. of you and grant them advantage on all saving throws until the end of your next turn.
Additionally, they receive a +2 bonus to AC and Immunity to Illness. While under the effect of Defenders Crest they also receive resistance to the damage type that their favoured weapon deals. (If they use spells they gain slashing resistance.)

This Ability can be used your Charisma modifier times and will be reset upon a long rest.

Protector of All

At 20th level you can choose to make any creature within 30 ft. of you succeed on saving throws. This can be used thrice per long rest.
Additionally, the Paladin gains the ability to take half of any damage that any creature within 20 ft. receives, saving that creature from all damage.
The Paladin themselves gets to choose any damage type and become resistant to it.