True Shield

A sphere of energy erupts from you, encasing and protecting you. Until the end of your next turn, the shield absorbs up to 50 damage that you would've taken before shattering, including the triggering attack, spell, or effect, leaving you unharmed. Line effects and spells, such as lightning bolt and some dragons' breaths, stop completely at the sphere if its damage is entirely absorbed.

The shield reflects a magic missile spell back to the caster, using its spell casting ability, instead of absorbing damage.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the amount of damage the shield absorbing increases by 10 for each slot level above 5th.