Anleil's Field of Frost

A surge of blue energy flows through your extended hand to a point you choose within range which then explodes from the ground creating an explosion of ice. 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, or half as much damage on a successful one.

Additionally, until the beginning of your next turn the area in which the spell was cast becomes difficult terrain, when a creature begins or ends it's turn within the area, it takes 1d6 cold damage for every 5 feet it travels.

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.