atavarr's personal gravitational upset.

you use the power of an octarine to make a targets body believe gravity is acting 90 degrees to where it normally is. the target must make a dexterity saving throw, with disadvantage if there are no clear things to grab on to. on a failed save, they fall to the nearest vertical surface in a horizontal direction, taking fall damage as if you had fallen that distance horizontally. if they succeed, they remain hanging on. for them, gravity becomes oriented in that direction for the duration.