Environmental Assimilation

Earths Retaliation. As a bonus action, in a 10ft radius circle everything becomes difficult terrain (It increases by 5ft ever level above 4th). 

Blades of Retribution. The environment starts to turn on the target, or targets, by creating sharp blades coming out of the floor or ceilings. As an action, the blades deal 2d6 slashing damage for a 5x10ft line, but if its a single target then it becomes 2d8 piercing damage. 

Terrains Guard. As a bonus action The surrounding area creates a wall to give half cover within the area.

At higher levels: Every level above 4th the damage increases by 1 die. The radius also increases by 10ft.