Icy Manipulator

This metallic sphere is 6 inches in diameter, with small lines tracing an unrecognizable pattern around the outside. The sphere has 8 charges, and recovers 1d8-1 charges every day at dawn. As an action, you may expend a charge, causing the sphere to split open in the middle, firing a beam of blue-white light at one creature within 60 feet. That creature must succeed on a DC 16 Constitution saving throw, or become petrified until the end of its next turn. Rather than turn to stone, a creature petrified in this way is turned to ice. When you expend the last charge in this item, roll 1d20. On a result of 1, the orb explodes. You take 1d10 cold damage and must make a DC 16 Constitution saving throw to avoid being petrified.