Arcane Detonation

You plant unstable energy at a point in space that detonates in multiple explosions. Choose a 10-foot sphere that you can see within range. Creatures and objects within that sphere take 2d6 Force damage immediately. At the end of your next turn the sphere detonates again, and creatures and objects within the space takes 2d6 Force damage again.

Chain Explosion

At higher levels, this spell does more damage and affects a larger space. For every two spell levels above 2nd level, add another explosion of the same size and damage on the subsequent turn after the last explosion.