Blackforge's Stone Hammer

You throw a handfull of sand and use your magic to transform it into a large, solid stone hammer, and launch it at your foe, afterwards, it explodes on contact.

Make a ranged spell attack, on a hit, the launched hammer deals 4D8 Bludgeoning Damage, afterwards, each creature within 10 feet makes a Dexterity Saving Throw, on a failed save they take 1D10 Piercing Damage.

At higher level casting. for each spell level higher than 2nd level, add a D8 Bludgeoning Damage to the initial impact.