Arcane Explosion
3rd-level Evocation
Casting Time: 1 action
Range: Self
Components: VS
Duration: Instantaneous
You create a tremendous burst of arcane energy that explodes from you. Each creature within 20 feet of you must succeed on a Constitution saving throw. Those creatures take 4d10 force damage on a failed save, or half as much damage on a successful one.
If you cast this spell again on your next turn, it deals an additional 1d10 force damage
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.
Source: Homebrew
