Thundering Rush

As an action, you may utter an incantation and scatter a pinch of powdered roc bone in a direction of your choice, causing the world to appear to slow around you for a moment as you rush forward. You immediately move 120 feet in a straight line in the chosen direction (which may be an upwards angle). All creatures within 5 feet either side of this line must make a dexterity saving throw, taking 8d10 thunder damage on a failure, or half as much on a success. This is audible from 300 feet away. 

After completing this movement, you take bludgeoning damage for each creature damaged in this way equal to 8 minus your constitution modifier (e.g., if you have a constitution modifer of +3 and damage 5 creatures with this spell, you take 25  ((8-3)*5) bludgeoning damage. If you cannot travel the full distance due to colliding with a creature or object of size huge or larger, you take damage as if you had fallen 120 feet.

If casting this at 5th level or higher, the damage you deal to other creatures increases by 1d10, and the damage you receive for each creature collided with increases by 1 for each level above 4th. 

If casting this at 6th level or higher, you take one point of exhaustion and the distance you travel is doubled to 240 feet, as does the potential "fall" damage you receive from colliding with an object.