Arcane Burn

You chose a point in range that you can see, and arcane power falls in a radius of 15 feet around the point you chose. All creatures within the area must make a Dexterity saving throw or take 4d8 force damage and their AC becomes 10 (or remains the same if lower than 10) until they leave the area of the affect. On a successful save, the creature takes half damage, and their AC is unaffected.

At higher levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.