Undulating Ground

You touch the ground at your feet and cause it to ripple and shake in a 60-foot cone away from you in a direction of your choice. For the spell’s duration, the area is treated as difficult terrain and any creature that ends its turn in the area, or moves into it for the first time on a turn, must make a Strength saving throw. A prone creature has disadvantage on this saving throw. On a failed saving throw, a creature is knocked prone. If a creature that is already prone fails this saving throw, its movement speed is reduced to 0 until the beginning of its next turn.