Elukron's Orb Of Frost

Jagged deep blue icicles grow from the palm of your hand into an spiked orb of pure frost. You throw the orb at the target location, and it explodes in a hail of piercing icicles and freezing air. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 cold damage on a failed save and have their movementspeed reduced by 10 feet to the end of their turn, or half as much damage on a successful save and no movementspeed reduction. 

The cloud of extreme cold spreads around corners. It freezes 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 1d6 for each slot level above 3rd.