A blast of frosted energy shoots out from you.
Creatures in a 10 feet sphere around you make a constitution saving throw. On a failed saving throw they take 2d8 cold damage and have there speed reduced by 10 feet until the end of thier next turn. On a success they take half the damage and don't have there speed reduced.

higher level slots: for each spell slot above first there speed is reduced by an additional 5 feet