Crystalline Splash

A brilliant crystal flies from your pointing finger to a point you choose within range and then shatters into a crystalline mass. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 piercing damage on a failed save, or half as much damage on a successful one. In addition, if when casting this spell a creature fails the saving throw, roll a d6. On a 1, the creature takes 2d6 acid damage. On a 2, the creature takes 2d6 cold damage. On a 3, the creature takes 2d6 fire damage. On a 4, the creature takes 2d6 lightning damage. On a 5, the creature takes 2d6 necrotic damage. And on a 6, the creature takes 2d6 radiant damage. The caster can choose the damage type if wearing a refined crystal necklace, but if not, must roll to determine the type. 

The crystals spread around corners. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the piercing damage in this spell increases by 1d6 for each slot level above 3rd.