Cannon of Haima

You fire an arcane cannonball in an arc to a point within range before detonating in a massive explosion. Each creature in a 30-foot-radius Sphere centered on that point makes a Dexterity saving throw, taking 6d10force damage on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 2d10 for each spell slot level above 5.