The cryo cannon's barrel spins rapidly, causing the air inside to be chilled to sub-zero temperatures. Upon activation, it launches forth a large hailstone surrounded by chilling air, which follows the hailstone on its path.   The target of the hailstone must make a CON saving throw. On a failed save, it takes 7d8 + 30 cold damage. Upon a successful save, it takes half as much.   Regardless of the save, the creature hit by the hailstone is immediately frozen and encased in a large ice cube. This encasing lasts for 3 rounds before melting away. During the encasement, the creature suffers the same penalties as the petrified status effect.