Nirto's Concussive Blast

You gather and accumulate the raw power of the weave into your fist and release it all in a single punch. Make a melee spell attack roll. On a hit, the target takes 6d8 Thunder damage and 6d8 Force damage.

If the target is Large or smaller, it is pushed horizontally 60ft away from you and has the Prone condition. If the target hits an obstacle located 30ft away or less from you, both the target and the obstacle take an extra 2d8 Bludgeoning damage and are knocked Prone, and the target continues its course 20ft further away from the obstacle on the same trajectory, unless the obstacle cannot be moved or pushed through. 
If the target is Huge or larger, it is only pushed 30ft away after taking the damage and suffers no other effect.

On a miss, the blast manifests as a shock wave of concussive force. Each creature (including your initial target) within a 30ft cone must make a Strength Saving Throw. On a failure, a creature takes 2d8 Thunder damage. If it is Large or smaller, it is also pushed 20ft away. On a success, a creature takes half the damage only.
A nonmagical object that isn’t being worn or carried also takes the damage if it’s in the cone’s area.

Hit or miss, the spell creates a loud bang audible from 600ft away. It also shatters windows and topples objects within 30ft of you.

Using a Higher-Level Spell Slot. Every damage roll of this spell increases by 1d8 for each spell slot level above 6.