Undulating earth

You touch the ground at your feet and cause it to ripple in a 60-foot cone away from you in the direction of your choice. For the duration of the spell, the ground continues rippling and shaking. The area is treated as difficult terrain and every creature in the area must make a successful Dexterity saving throw at the end of its turn or fall prone. Objects fall over, but structures and rooted plants are unaffected.