Gravity Smash

5th-level evocation

Casting Time: 1 action
Range: 120 feet (40-foot-radius, 100-foot-high cylinder)
Components: V, S
Duration: Concentration, up to 1 round
Class: Sorcerer, Warlock, Wizard

You strike the ground, choosing a point you can see within range to begin accumulating gravity. A 40-foot-radius, 100-foot-high cylinder centred on that point becomes difficult terrain until the start of your next turn. When the spell ends, the gravity reaches a critical magnitude, smashing all creatures in the cylinder downwards; each creature in the area must make a Strength saving throw. If the spell lasts its full duration and ends at the start of your next turn, then, on a failed saving throw, a creature takes 8d10 force damage and is knocked prone. If the spell ends before the start of your next turn, a creature takes 4d10 force damage on a failure instead. On a successful save, a creature takes half as much damage and isn’t knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, both damage values increase by 1d10 for each slot level above 5th.

Source: Heliana's Guide to Monster Hunting