Earth Tomb

You cause the earth to fall away in a 10 ft. radius under a point you can see within range. Creatures within the spell's area must succeed on a dexterity saving throw or fall to the bottom of the pit. Creature's that succeed on the throw may use a reaction to jump to the an unoccupied space on the edge of the new pit or gently slide to the bottom. Creatures with flight speed may instead use their reaction to hover over the pit. Creatures actively flying are not affected by this spell.

The walls of the pit become difficult terrain due to their sheer inclines. 

You may use your action to end concentration on the spell and cause the walls of the pit to cave in on creature's at the bottom of the pit. Creature's must succeed on a dexterity saving throw or take  4d10 bludgeoning damage and become restrained as they are crushed by fallen rocks. This effect can only happen if the casting creature manually ends concentration. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the pit becomes 10 ft deeper and damage from manually ending the spell is increased by 1d10 for every level above 4th.