Barrier

An protective barrier of magical force appears and surrounds a creature of your choice within range.

Each time a creature targets a creature with a barrier on it with an attack during the spell's duration, the attack instead targets the barrier.

A barrier´s AC equals 12 + the casters Intelligence modifier. If an attack hits a barrier, the barrier is destroyed. A barrier can be destroyed only by an attack that hits it. It ignores all other damage and effects. The spell ends when the barrier is destroyed.

At Higher Levels. When you cast this spell using a spell slot of 3th level or higher, the barrier´s AC increases by 1 for each slot level above 2rd.