Tales of the Valiant Players Guide (pg. 310)
3rd ring Primordial, Conjuration
Until the spell ends, freezing rain and sleet fall in a 20-foottall cylinder with a 40-foot radius centered on a point you choose within range. The area is heavily obscured, and exposed flames are doused.
The ground in the area is covered with slick ice, making it difficult terrain. When a creature enters the spell’s area for the first time on a turn or starts its turn there, it must make a DEX save. On a failed save, it falls prone.
If a creature is concentrating in the spell’s area, the creature must make a successful CON save against your spell save DC or lose concentration.