Descending Dark

You slam yourself into the ground with magically enhanced strength, releasing a wave of mixed soul and dark energy in a 15-feet radius sphere centered you. All creatures in that radius must make a Strength saving throw, taking 3d6 Force damage and 3d6 Necrotic damage on a failed save, as well as being pushed 10ft away and knocked prone, and half as much damage on a successful one and not being pushed or knocked prone. After releasing the wave, you then gain resistance to bludgeoning, piercing, and slashing damage until the begining of your next turn.

If casted while airborn, you will first dive downward at a rate of 120 feet per turn and then release the wave of energy upon touching the ground, taking no damage from the fall. If you were to cast this spell on a fragile surface, like glass or up to 3 inches of wood or 1 inch of stone, that surface would be destroyed and they would continue to descend until reaching a more solid surface.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the Force and Necrotic damage each increase by 1d6 for each slot level above 4th.

Clearly a D&D adaptation of the spell of the same name in Hollow Knight.