Aegis of the Devotee

While holding this shield, you have a +1 bonus to AC. This bonus is in addition to the shield's normal bonus to AC. Each time the paladin gets a sacred oath feature the shield provides a new benefit:

• 3rd level: Intervene. As reaction to an enemy attacking an ally of yours, you become a beam of light and teleport up to 30 feet in space adjacent to the ally in melee range with the attacker. Doing so, you add your shield's AC bonus to the ally's AC against the incoming attack, the ally also gets to the ally's AC against the incoming attack, the ally also gets temporary hit points equal to your Charisma modifier + your AC shield bonus until the start of your turn. Once you use this feature it recharges the next dawn.
• 7th level: Condemn. Once per turn when an enemy misses you with a melee weapon attack, the shield gets a charge of condemn. When the shield reaches 4 charges, the next melee weapon attack that misses you triggers a beam of blinding light which originates from the shield. The attacker must succeed on a Constitution saving throw against your spell save DC or be blinded until the end of his turn and the shield's charges are consumed. The shield maintains a charge for a minute.
• 15th level: Faithful Defender. The shield grants an additional +1 bonus to AC.
• 20th level: Light of Justice. While your holy nimbus feature is active, you emanate an aura of justice that affects any creature within 30 feet of you. Chaotic creatures have disadvantage on attack, you emanate an aura of justice that affects any creature within 30 feet of you. Chaotic creatures have disadvantage on attack rolls against you, lawful or good allies deal 1d4 extra radiant damage on hit (including you).

Note: This Shield can be found on reddit, I am not the original author.

Shields require the Utilize action to Don or Doff. You gain the Armor Class benefit of a Shield only if you have training with it.

Notes: Bonus: Armor Class, requires attunement by a devotion paladin, Combat, Warding