You punch a hole to the outer realms, at an unoccupied point within range. The hole bleeds black inky liquids, staining the world underneath. The hole lasts until dispelled.   The ground in a 10ft radius below the hole counts as difficult terrain. The area expands by 10ft at the end of each of your turns, to a maximum of 100ft.   Any creature ending its turn in the area must make a Constitution saving throw or be Poisoned while it stays in the area. Nonmagical plants in the area wither and die.