Glacial Skewer

You create a large spike of ice and launch it at a target. Make a ranged spell attack against the target's AC. If it hits, the target takes 4d10 cold damage and 4d4 piercing damage, and is pushed 10 feet away from you. On a critical hit, the target takes double damage and is pushed 20 feet away from you. If the target is pushed into an obstacle or structure that's Large or larger, the target becomes skewered by the ice spike and is Immobilized for 1 minute or until it Escapes.