Athena's Shield

You attempt to block a magical effect from hitting your physical form as a magic shield engraved with Athena's visage obstructs it's path.

When you are affected by a spell or magical effect that requires a Strength, Dexterity, or Constitution saving throw, after you roll your save but before the effect takes place, you may use your reaction to cast this spell and add +2 to your saving throw.  If you succeed and the effect requires you to take half damage, you instead take none.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can add +1 for each slot level above 2nd.