Theodore's Arcane Burst

You hurl a blast of pure arcane energy at a point within range, where it explodes in a 5-foot-radius Sphere. Each creature in that Sphere must succeed on a Dexterity saving throw or take 1d4 + your spellcasting modifier Force damage. 

Cantrip Upgrade. The spell creates two blasts at level 5, three blasts at level 11, and four blasts at level 17. You can direct the blasts at the same point or at different ones. A creature within it´s range must make a separate saving throw for each blast.