Bone Lance

A 10 foot lance of bone shoots out of a point on the ground or wall within range. All creatures in its path must make a dexterity saving throw, taking 10d10 piercing damage on a fail or half as much on a success. Creatures that fail their saving throw are also impaled, reducing their speed to 0 until the end of the casters next turn.

For each level above 5th, the lance is 5 feet longer and deals an extra 1d10 piercing damage.