Wall of Bone

You throw the bone, causing a wall of bone to sprout at the location it lands within the spell's range. This wall can be of the following dimensions: 10 feet tall by 10 feet wide, 15 feet long and 5 feet tall or vice versa. In any case, the wall is one inch thick, and each five-foot section of the wall is Armor Class 16, has 20 hit points, and is resistant to necrotic, fire, cold, and lightning damage, and is immune to poison and psychic damage.

Each creature in the wall's area as it appears is pushed out of it, landing on a random side of the wall, and must make a Dexterity saving throw. One a failure, the creature takes 2d6 bludgeoning damage and lands prone.

The wall lasts for the spell's duration, at the end of which it crumbles to dust.