Creeping Ice

You create a sheet of ice that covers a 5-foot square within range and lasts for the spell’s duration. The iced area is difficult terrain. A creature in the area where you cast the spell must make a successful Strength saving throw or be restrained by ice that rapidly encases it. A creature restrained by the ice takes 2d6 cold damage at the start of its turn. A restrained creature can use an action to make a Strength check against your spell save DC, freeing itself on a success, but it has disadvantage on this check. The creature can also be freed (and the spell ended) by dealing at least 20 damage to the ice. The restrained creature takes half the damage from any attacks against the ice.