Boon Companion's Bands
Source: Arcana Unleashed
Ring, Uncommon
Boon Companions’ Bands come in pairs and bear matching engravings. While wearing one of the bands, when you cast a spell or use a feature that forces other creatures in its area of effect to make a saving throw, you can protect the creature wearing the matching band if the creature is in the effect’s area. That creature automatically succeeds on its saving throw against the effect, and it takes no damage if it would normally take half damage on a successful save.
Once this property is used by either band, the bands can’t be used again until the next dawn. If one of the bands in a pair is destroyed, the other one crumbles to dust.