Arcane Detonation

A small arcane ball rushes from your hands to the point of impact at which point it explodes hitting everyone in a 20ft radius. Creatures in the 10ft radius at the center of the blast take 5d10 force damage and are knocked prone on a failed save, if they save successfully they take half damage and are not knocked prone. creatures on the outer radius that fail the saving throw must succeed a strength saving throw or be knocked prone and pushed 10ft away from the center, otherwise they take no damage and are not pushed or knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd. For every 3 levels above third the damage increases by 3d10 for creatures in the center.