You create a brief, shimmering shield of force that deflects an incoming attack. When you are hit by a melee or ranged weapon attack, you can use your reaction to gain a +2 bonus to AC against that attack, potentially causing it to miss. If the attack still hits, the damage is reduced by 1d4 points.

This spell’s damage reduction increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).