You transfer a portion of your protective magic to shield another from incoming threats. When a creature you can see within range is targeted by an attack, you may use your reaction to transfer any bonuses to your AC that are not due to worn armor or shields (ex. Mage Armor, Barkskin, Bladesong, Ring of Protection, etc.) to the targeted creature. Until the start of your next turn, the targeted creature gains all benefits of your magical protection, while your AC is reduced by that same amount.
Additionally, you gain temporary hit points equal to the transferred bonus. These temporary hit points only last until the start of your next turn. 

At Higher Levels: For every 2 levels about 2nd, the amount of temporary hit points you gain from this spell is multiplied by 2.