Dimension Tear

You attempt to redirect a hostile creature's attack. When a creature you can see is hit by an attack, or fails a saving throw against a single-target damage-dealing spell, but before damage has been rolled; a brief dimensional rift intercepts the attack, opening next to another creature within the spell's range. 

Make an Intelligence(Arcana) check to attempt to direct where the attack will emerge.

Once a new target has been established, they must make a Dexterity saving throw against your Spell Save DC. The target takes the original attack's full damage and effects on a failed save, or half as much on a successful one, suffering no additional effects of the original attack.