Crystal Core

You conjure four crystalline structures in unoccupied spaces that you can see within range. These cores float in place, filling a 5-foot area. As a part of your action to cast the spell, or as an action of subsequent turns, you can have one or more of the crystals fire beams of energy at a creature within 15 feet of it.

Make a ranged spell attack for each attacking crystal. On a hit, the target creatures take 3d6 force damage. Each crystal has hit points equal to 5 times your caster level, and AC equal to your spell save DC. The crystals all have immunity to poison, psychic, and radiant damage, as well as non-magical bludgeoning, piercing, and slashing damage not made from adamantine. The crystals all have resistance to acid, cold, fire lightning, and necrotic damage.