Event Horizon

You create a small black hole at a point you can see within range. The black hole is a spherical void with a diameter of 10 feet and a gravitational pull that distorts the space around it. The area within 30 feet of the black hole is considered difficult terrain.

Effects

Creatures within 30 feet of the black hole must make a strength saving throw at the start of their turn or be pulled 10 feet towards the black hole. On a failed save, a creature takes 4d10 force damage and is restrained until the start of its next turn. On a successful save, the creature is not pulled.

Any creature that starts its turn within 10 feet of the black hole must make a dexterity saving throw. On a failed save, the creature takes 8d10 force damage and is pulled into the black hole, becoming incapacitated and restrained until it escapes. On a successful save the creature takes half damage and is not pulled 

The black hole emits an aura of intense gravitational force. Any ranged weapon attack or spell attack made from the outside the black hole towards a point within 30 feet of the black hole is made with disadvantage.

Escaping the black hole 

A creature restrained by the black hole can use its action to attempt to escape by make a strength check against your save DC. on a success, the creature escapes and is no longer restrained

Concentration

Maintaining concentration on the black hole spell requires intense focus. each time you take damage while concentrating on the spell, you must make a constitution saving throw to maintain concentration, the DC equals 10 or half the damage you take, whichever is higher.