Divine Shield

You create a floating, spectral shield within range that lasts for the duration or until you cast this spell again. While the spell is active, you can use your reaction to move the shield to defend against a creature's attack. The shield's AC equals 1d8 + your spellcasting ability modifier. If the attack roll does not exceed the shield's AC, the shield protects you against the triggering attack. If the attack roll exceeds the shield's AC, the shield still protects you against the triggering attack but the shield shatters and the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the shield's AC increases by 1d8 for every two slot levels above 2nd.