Aerdan's Automatic Absorber

A Shimmering bubble is conjured to protect you from incoming attacks, the bubble absorbs half of any attack damage targeting the caster. On your next turn, you can add damage to one attack roll equal to half of the strongest blow to have been taken by the Absorber.

When cast at 4th level, the damage added to your next attack is the full damage of the strongest blow to have been taken by the absorber.