Earth Fissure

You cause the very ground beneath you to open up. You cause a fissure in the earth to open in a space within range. The fissure is 15ft wide, 150ft deep and extends to 80ft.

A creature attempting to cross the fissure must make an Athletics or Acrobatics check (its choice) against your spell save DC. If it fails by 5 or more, it falls to the bottom of the fissure, taking 15d6 bludgeoning damage. If it fails the check by less than 5, it makes another Dexterity save, falling into the fissure on a fail and pulling itself out on a success. The fissure closes up when the spell ends or is dispelled, trapping anyone left at the bottom.