Black Hole

You create a tiny black hole at a point you can see within range. The black hole is a sphere with a 15-foot radius. All fires and flames within 40 foot of the black hole-magical or otherwise- are instantly extinguished. Each creature within 40 feet of the black hole when it appears must make a Strength saving throw. On a failed save, the creature takes 20d6 force damage and is pulled to with 5 feet of the black hole. On a successful save, the creature takes half as much damage and is knocked prone but isn't pulled towards the black hole. 

A creature within 5 feet of the black hole at the start of it's turn must make a Strength saving throw or take 8d6 force damage and have its speed reduced to 0 until the start of it's next turn. A creature within 40 feet of the black hole (but not within 5 feet of it) at the end of it's turn takes 2d6 cold damage. A creature reduced to 0 hit points while with 5 feet of the black hole dies immediately.