Forest of Dread

You touch the ground beneath you and tree-like bones sprout from the ground in a 30-foot-radius, 20-foot-high Cylinder centered on you. Each creature of your choice in that area must make a Dexterity saving throw, taking 4d8 Piercing damage on a failed save, or half as much damage on a successful one.
For the duration, the area becomes Difficult Terrain, and when a creature moves into or within the area, it takes 2d8 Piercing damage for every 5 feet it travels; you are Immune to this effect. The forest of dread provides Half Cover to any creatures inside the area.