Turn Stone

You touch an unworked pebble or boulder that fits within a 10-foot cube within range, and choose one of the following effects.

Turn Pebble to Boulder.
If the target is a pebble it grows up to the maximum size of the area in any single dimension. As part of the casting you may throw the pebble in a direction, turning it into a boulder as it leaves your fingers. In this way, the thrown boulder flies in a straight line up to 60 feet in a direction you choose before falling to the ground, stopping early if it impacts against an object, surface, or creature of its size or greater at the DM's discretion. If the boulder would strike a creature, that creature must make a Dexterity saving throw. On a failed save the boulder deals 4d12 (26) bludgeoning damage.

Turn Boulder to Pebble.
If the target is a boulder or rock that fits within a 10-foot cube it shrinks to the size of a pebble.