Crystal Confinement

You attempt to preserve a number of creatures in a shell of ice. When you first cast this spell you can choose up to 20 creatures you can see, medium targets count as two creatures, Large targets count as four creatures, Huge targets count as eight creatures, and Gargantuan targets count as 20 creatures.

Each target must make a Constitution saving throw, or choose to automatically fail the save. On a successful save, nothing happens to the target this round but it must repeat the save at the start of your next turn—provided you maintain concentration on the spell. If the saving throw fails by 5 or more, the target is instantly petrified as it becomes encased in crystalline ice. Otherwise, a creature that fails the save is coated in a creeping rime of ice and is restrained. The restrained creature must repeat the saving throw at the end of its next turn, becoming petrified on a failure or ending the restrained effect on a success. A creature petrified by this spell remains petrified until you die or you choose to end the effect. No other magic can free it. When a creature becomes petrified, you can choose for it to remain aware of its surroundings, though its senses are limited to what it could perceive while motionless, through a thick coating of clear ice. While coated in ice, the creature is immune to all damage. Otherwise, the target is affected by the petrified condition as normal.