Circle of Power
An aura radiates from you in a 30-foot Emanation for the duration. While in the aura, you and your allies have Advantage on saving throws against spells and other magical effects. When an affected creature makes a saving throw against a spell or magical effect that allows a save to take only half damage, it takes no damage if it succeeds on the save.
Circle of Power 5.5e 2024 vs. 5e 2014 edition differences
The 2024 version adds cleric and wizard classes, broadening applicability. It specifies an emanation with a 30-foot radius, whereas the 2014 version describes a sphere centered on the caster. The 2024 version simplifies the language, but mechanically, both grant advantage on saving throws and grant immunity to damage on successful saves against half-damage effects.