Arcane Orbit

You create a quartet of motes of arcane energy that revolve around you as you move for the duration. 

When a creature moves, makes an attack, casts a spell, or ends its turn within 5 feet of you, it must make a Dexterity saving throw. On a failed save, the creature takes 5d6 force damage as one of the motes slams into it and explodes. On a successful save, the creature takes no damage and the mote continues orbiting you. A creature may be targeted by multiple motes within a single turn, making a separate Dexterity saving throw for each mote.

At Higher Levels. When cast with a spell slot of 6th level or higher, an additional mote is created for every two slot levels above 5th.