Bone Pillar

You designate a 5ft square up to 60ft away from you and a 10ft tall pillar of bones sprouts from the ground beneath it. Any creature currently on that square must make a Dexterity saving throw or takes 2d8 piercing damage and is pushed to a random adjacent unoccupied square (Roll 1d8 to determine it), being knocked prone on arrival. A succesful save halves the damage and prevents the prone condition. The pillar blocks the square for up to 1 minute, essentially making it unpassable terrain.

You may cast this spell at a higher spell slot, increasing the damage by 1d8 for every level over the 1st.