Alexander's Well of Gravitas

The forces of the earth are doubled in potency in a 20-foot cube starting from a point within range. The area becomes difficult terrain. When the spell ends, the forces of the universe reverse to normal.

If a creature is standing in the area when you cast the spell it must pass a Strength save or be knocked prone and restrained. A restrained creature can release itself by using its action to attempt another Strength save, being freed on a success.

At higher levels:

If cast using a 3rd-level spell slot, a creature standing in the area has now a disadvantage, and any creature entering must pass a Strength save or be knocked prone and restrained.

If cast using a 5th-level spell slot, a creature standing in the area must pass a Strength save, it takes 5d8 force damage for the sudden change of force and is knocked prone and restrained in a fail, or half the damage and it's not restrained on a success. Any creature entering must pass a Strength save or be knocked prone and restrained.

When casting this spell using a spell slot of 6th or higher, the damage increases by 1d8 for each slot above 5th until 8th.

If cast using a 9th-level spell slot, you have the strength of a planet and armies bow to your feet. The area of effect increases to a 360 foot cube and the range and the cast range increases to 1 mile, the area becomes difficult terrain. Any creature standing in the area when you cast the spell or when they enter the area for the first time must throw a Strength saving throw with disadvantage, all creatures take 5d8 force damage and are knocked prone and restrained in a fail or take half the damage and knocked prone on a success.