You cause a pillar of stone to rise from the ground in a space you can see. The pillar of stone has a diameter of 5 feet and raises up to 30 feet into the air. The ground where a pillar appears must be wide enough for its diameter, and you can target the ground under a creature if that creature is Medium or smaller.   If a pillar is created under a creature, that creature must succeed on a Dexterity saving throw or be lifted by the pillar. A creature can choose to fail their save. If a pillar is prevented from reaching its full height because of a ceiling or other obstacle, a creature on the pillar takes 3d8 bludgeoning damage and is restrained, pinched between the pillar and the obstacle. The restrained creature can use an action to make a Strength or Dexterity check (the creature’s choice) against the spell save DC. On a success, the creature is no longer restrained and must either move off the pillar or fall off it.   The pillar has AC 5 and 30 hit points. When reduced to 0 hit points, a pillar crumbles into rubble, which creates an area of difficult terrain with a 10-foot radius that lasts until the rubble is cleared. Each 5-foot-diameter portion of the area requires at least 1 minute to clear by hand.