When you are attacked by a ranged spell you may use this spell as a reaction to absorb 2d8 of the damage. If you absorb all of the damage from the spell you capture it in yourself and my cast that spell as an attack on your next turn. If you do not chose to attack with the spell you have two turns after you absorb the spell to release it. If you keep the spell in your body any longer you take 2d6 necrotic damage for each turn you do not release it.   

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra reduced damage increases by 1d8 and the damage taken increases by 1d6.