Spelldrinker Aegis

Armor (shield), rare

This magic shield hums like a bell when struck with magical force. Whenever you make a saving throw against a spell or magical effect while holding the shield, you gain a +2 bonus to the roll if the spell or effect deals damage.

Arcane Overshield. When you succeed on a saving throw against a spell or other magical effect, you can use your reaction to take no damage from the spell (if it would normally deal half as much damage) and gain 1d10 + 10 temporary hit points. You must be holding the shield. Once used, this property can't be used again until the next dawn.

As even the scars of the Justicars' crusade pass from the living memory of all but elves and angels, it is important to keep alive the tales of the Spelldrinkers. The order was founded in forgotten days, then betrayed and eclipsed by its outgrowth, yet it eventually brought an end to both itself and its betrayers. But now, many forget even that the Justicars and Spelldrinkers were not only distinct, but indeed opposite.
To understand, one must only look to the aegis of each order. The Justicars' was a cruel thing, only capable of breaking the will of another; the Spelldrinkers' was a true shield, a defense against magic that may too make cooperation with its wielders a safer path. The one pursues protection through harm; the other through resilience and aid.
—Excerpt from Remembrance of the Spelldrinkers