Black Hole

You use magic to compress the atoms of a 5 foot sphere into an infinitely small infinitely dense point, creating a singularity. Every creature within 1 mile must make a DC 30 Strength saving throw at the start of their turn on each round the Black Hole exists. On a failed save creatures take 10d10 damage and are pulled 100 feet closer to the Black Hole. Half as much on a success and be pulled 50 feet closer. Any creature in the space occupied by the Black Hole is sucked in and instantly killed and any object or structure is instantly destroyed. If a creature is killed this way the Black Hole doubles in size, as does its range and damage die. Any round in which no create gets sucked into the Black Hole it halves in size, as does its range and damage die. If the Black Hole's size is halved while occupying only a 5 foot sphere or smaller it disappears and the spell ends.