Metabot's Manual of Magical Maneuvers

Spell Flux

2-level Abjuration

You start projecting a protective magical force which emanates from your hand. You have half cover from attacks and damaging effects you can see, but cannot use your hand in any other way, except for somatic components of spells you cast. You also gain no benefit from a shield.
If a ranged attack hits the spell flux (the attack would have hit your original AC but misses your AC with the +2 bonus from cover) you can use your reaction to deflect the blow. Make a ranged spell attack on a creature of your choice within 30 feet of you, dealing the damage and effect of the original attack on a hit.
If you lose concentration on this spell before the end of its duration, you can reweave the lingering magical energies on a subsequent turn using your action. The spell's effects resume until the original duration ends or you lose concentration again.
At higher levels: When you cast this spell using a spell slot of 5th level or higher, the spell grants three-quarter cover.