Brionac

Three luminous copies of the weapon used in the casting appears and orbits around you. When you cast the spell, and as a bonus action each turn, you may expend one copy to attack  one creature or object within 60ft of you. if you do so, make a ranged spell attack, adding the weapon's bonus if it has one. On a hit, the target takes 4d12 Force Damage or the weapon's normal damage type(Your choice) or the weapon's normal effects. Whether you hit or miss, the copy is expended. The spell ends early if you expend the last copy.

you gain a +1 to ac and dex saving throws for every copy remaining. Additionally, if you have four or more copies remaining, you gain the effects of half cover. if you have six or more copies remaining, you gain the effects of three-quarters cover

Using a Higher-Level Spell Slot:  the number of copies made by this spell increases by one for every spell level above 3