Dimensional Hole

You open a black hole somewhere within 100 ft of you that is 5 ft by 5 ft wide. All creatures within 100 ft of the black hole feel its effects.

Effects: At the beginning of your turn, you must make a Constitution saving throw or have your movement halved until end of turn. At the beginning of your turn, you are sucked 5 ft closer to the black hole. In addition, when you are moving in any direction that is away from the black hole it costs double the movement to move there. When you enter or end your turn within 10 ft of the black hole, you take 10d10 force damage and must make a constitution saving throw or be stunned. If you enter the black hole anytime, you die.