Here’s a spell creation based on your request:

**Magic Turret Barrage**

**Level:** 5th-level evocation

**Casting Time:** 1 minute

**Range:** Self (100-foot radius)

**Components:** S, M (a small crystal orb)

**Duration:** Concentration, up to 10 minutes

**Effect:** You conjure a number of magical turrets within range, each capable of firing energy bolts at enemies.

You gain a number of turrets  equal to one half their caster level. that float around you at a certain distance whenever a foe gets within 120 feet within a turrets range they get hit with a single magic missile. Each turret may shoot a magic missile at its closest foe on initiative 10 in this way each round.