You create a crackling, black spherical void with a strong gravitational pull at a point you designate, which pulls creatures towards the center point of the spell within a 30-foot radius sphere. Every foot of movement in this area costs 5 feet instead. No light, magical or otherwise, can illuminate the area, and creatures fully within the area are blinded.

For the duration, each creature that starts its turn in the black hole or enters it during its turn must make a Strength saving throw. On a failure, a creature's speed becomes 0 and it can't benefit from any bonuses to its speed until the beginning of its next turn, and is then pulled 10 feet towards the center point of the spell. Creatures who fly or use a flying speed during their turn make the saving throw with disadvantage. If the creature cannot be pulled any closer towards the center or otherwise would have to occupy another creature's space, it takes 8d8 force damage.

When the spell ends, the black hole shrinks to a tiny speck of darkness, then violently explodes dealing 4d8 force damage to any creature in the 30-foot-radius sphere.