Cruthian Bomb

You craft an improvised explosive device through a combination of Magic and Machine. The bomb can be customized to release different types of damage depending on the materials used to craft it. The radius of the blast can also be adjusted to be anywhere from a 5 to 30 foot radius sphere centered on a point within range. Any creatures within this area must make a Dexterity saving throw. A target takes 8d6 damage of whatever you have decided on a failed save, or half as much damage on a successful one.

The blast spreads around corners. It interacts with objects in the area depending on the damage type (I.E., ignites flammable objects in the area that aren't being worn or carried).

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d6 for each slot level above 3rd.