Oath of the Watchtower.

The Oath of the Watchtower is devoted to the stewardship of its land and the people who live there. While traditional paladins leap to meet danger head-on, paladins who swear this oath are empowered to smite evil where it stands from afar. Often reserved by their very nature, these paladins stand as stoic landmarks in the midst of turmoil, and offer guidance and safety to those in their care. Many have served as town guards or stood watch atop castle battlements, and are equally likely to favor a bow and arrow as they are a sword and shield.

Level 1 Features:

Tenants of the Watchtower.

The tenets of the Oath of the Watchtower hold a paladin to protect their flock and keep an ever-mindful eye, as danger is always lurking in the shadows.
-Guard the Flock. Your vigilant watch is the first line of defense against impending evil.
-Harbor the Weary. Your steadfast protection provides comfort and safety.
-Show the Way. Your patience and guidance shine a light for others to find their 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: Divine Sniper.

You can empower a weapon with divine precision using your Channel Divinity. As a bonus action, you touch a bow or crossbow within your reach. You can use your Charisma modifier, instead of Dexterity, for any attack and damage rolls you make with it for the next 8 hours or until you finish a short or long rest. For the duration, you can use your Divine Smite feature when you hit a target with a ranged weapon attack using it. When you do, the extra damage dice are d6s, instead of d8s.
If you later gain the Improved Divine Smite feature, you deal an extra 1d6 radiant damage whenever you hit a creature with a ranged attack using this bow or crossbow.

Channel Divinity: Warding Tower.

During a short or long rest, you can create a magical ward around you to safeguard your respite using your Channel Divinity. At the start of the rest, you can spend 10 minutes warding the area in a 15-radius circle on the ground, after which point a 15 foot tall cylinder extends upward from the circle. The cylinder remains until the rest ends, you roll initiative, or you leave the area, up to 8 hours. The cylinder is transparent from the inside, but is shrouded by camouflaging illusions from the outside, allowing creatures to see to the other side of the cylinder, as if it were not there. Creatures outside the cylinder only become aware of it with a successful Wisdom (Perception) check against your paladin spell save DC, but make the check with a penalty equal to half your paladin level (rounded up). In addition, you are mentally alerted whenever a Tiny or larger creature whom you have not designated, as per the alarm spell, comes within 30 feet of the cylinder.
Any light from open flames inside the space, such as a campfire, torches, or similar, is not visible outside it. The atmosphere inside the space is comfortable and dry, regardless of the weather outside. Until the rest ends or you leave the cylinder, you can command the interior to become dimly lit or dark.
If you have no more uses of your Channel Divinity, you can still use this option by expending a spell slot of 1st level or higher as part of creating the magical ward. When you do, the maximum number of hours that it can remain is equal to twice the level of the spell slot used.

Level 7 Feature:

Aura of Vigilance.

Starting at 7th level, you gain a bonus to Wisdom (Perception) checks you make that rely on sight; this bonus is equal to your Charisma modifier (minimum of +1). You also exude a watchful aura, which extends from you and protects you and friendly creatures within 10 feet of you. Affected creatures within the aura cannot be surprised, and opportunity attacks against them are made with disadvantage. You can choose to move the origin of your Aura of Vigilance to another willing creature. As an action when you touch a creature, or as part of the action to use your Lay on Hands feature, you can choose to make that creature the origin of your Aura of Vigilance. Alternatively, when you deal damage to a target with your Divine Smite, you can move the origin to a willing creature that you can see within 5 feet of that target. The aura originates from this creature until you are more than 150 feet away from it, until it dies, or until you use a bonus action to end the effect, at which point the aura returns to you. Moving the auras origin to a different creature removes it from the first. While the aura is originating from another creature, you can use an action to sense the direction of its location. Any other aura that you have is not moved by this feature.
At 18th level, the range of this aura increases to 30 feet.

Level 15 Feature:

Sentinels Aid.

Beginning at 15th level, you can use your Lay on Hands feature on a creature that you can see within 60 feet of you, instead of a creature you touch. To do so, you must expend twice as many hit points from your pool as normal.

Level 20 Feature:

Avatar of the Watchtower.

At 20th level, your steadfast presence provides your allies with boundless confidence and protection. You can use an action to gain the following benefits for 1 minute:
-You have resistance to bludgeoning, piercing, and slashing damage.
-You regain 10 hit points at the start of each of your turns while you have at least 1 hit point.
-Friendly creatures in your Aura of Vigilance are considered to have half cover against hostile attacks and effects.
Once you use this feature, you cannot use it again until you finish a long rest.