Terra Spike

Choose a creature or object that you can see that is adjacent to a surface within range, like a floor, wall, or ceiling. The surface does not need to be made of a single contiguous material, but it must be mostly made of earth, rock, sand, stone, metal, ash, or other suitable earth-like materials, and it must be at least 6 inches deep for the spell to be cast.

You summon a solid spike out of the surface material to impale the target, which must make a Dexterity saving throw. On a failed save, the target takes 3d10 piercing damage, or half as much on a successful save. If the target is flat against the surface, such as a prone target being impaled from the ground, it has disadvantage on the saving throw and the damage increases to 3d12. The spike crumbles apart after the attack is complete.

Using a Higher-Level Spell Slot. The damage increases by 1d10 or 1d12 for each spell slot level above 2.