Entropy Field

You cause gravity to magnify and increase heavily in an 80 foot cube centered on a point within range. While within the cube, a creature’s jumping distance is halved, if a creature is flying within the cube at the start of each of their turns they must succeed on a Strength saving throw or be knocked prone and immediately fall 30 feet, and if a creature attempts to get up from being prone they must f irst succeed on a Strength saving throw or fail to stand up