Block of Stone

A nonmagical cubic block of solid stone springs into existence at a point you choose within range. The cube is 2.5 feet across.
If the block is in a creature’s space when it appears, the creature is pushed to one side of the block (your choice). The block can’t occupy the same space as a creature or object. The block doesn’t need to rest on any firm foundation. It must, however, merge with and be solidly supported by existing stone (including another block of stone created by this spell). Thus, you can use multiple castings of this spell to construct a wall, bridge a chasm or create a ramp.
If you maintain your concentration on this spell for its whole duration, the block becomes permanent and can’t be dispelled. Otherwise, the block disappears when the spell ends.