You cause non-magical spikes of stone to burst from the ground, forming a barricade. The barricade is 5 feet thick and composed of four 5-foot-by-5-foot blocks. Each block must be in range, but do not need to be contiguous with at least one other block. The barricade has 5 AC and 30 Hit Points. When reduced to 0 Hit Points, the block crumbles into rubble, which creates an area of difficult terrain with a 5-foot diameter that lasts until the rubble is cleared, which requires 1 minute to clear by hand.   When the barricade appears, each creature within its area is pushed to one side of the barricade (your choice) and must make a Dexterity saving throw. On a failed save, a creature takes 4d6 piercing damage, or half as much damage on a successful save, if they are pushed to a side you decide deals damage. If a creature would be surrounded on all sides by the barricade (or the barricade and another solid surface), that creature can use its reaction to make a Dexterity saving throw. On a success, it can move up to its speed so that it is no longer enclosed by the barricade.   Any sides of the barricade, selected by you when you cast this spell, deals 6d6 piercing damage to each creature that enters for the first time on a turn or starts its turn within 5 feet of that side of the barricade. A creature can not be affected by more than one barricade at the start of their turn.   If you maintain your concentration on this spell for its whole duration, the barricade becomes permanent and can't be dispelled. Otherwise, the barricade disappears when the spell ends.