Void Star

You create a 15ft sphere that appears in any space within range. The sphere covers all spaces within 30 ft of it in magical darkness that even magic cant see through. Every Creature within 60ft of the sphere must make a Strength saving throw or be pulled 15ft towards the center of the sphere, and creatures within 30 ft of the sphere make the save at disadvantage. A creature that starts their turn in the sphere or enters it for the first time takes 30 (10d6) force damage.

Moving away from the sphere costs double their movement, and moving towards it costs half. 

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the force damage increases by 2d6 for each slot level above 6th.