Arcane Bomb

Target a creature within range that is under the effects of a concentration spell that deals damage or in range of a Concentration spell’s area of effect. Each creature in a 20-foot-radius sphere centered on that creature must make a saving throw of the same type as the concentration spell. A target takes 5d10 damage of the same type as the concentration spell on a failed save, or half as much damage on a successful one.

The blast spreads around corners. If there is more than one damage type, you choose which type of damage to inflict  

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for every 2 slot levels above 3rd