Defenestration

de·fen·es·tra·tion

noun

formal•humorous

the action of throwing someone out of a window.

"death by defenestration has a venerable history"

   "Godfrey didn't feel the push to act, per se. He was the push. As his rival's shadow fell from the window over him, ebony-enriched blade swinging, Godfrey reached out in a split second of primal instinct. No sparks flew from his fingertips, no materials nor words were required to fullfil his bidding. This... this was the purest form of the Arcane. Cords of the Weave so ancient as to predate the gods themselves. This was their means for discarding the pits of hell. This is what was done to them -- the reason they found themselves in the realm of abberant horrors. Perhaps, even, this was the dream of the great old ones. That all would succumb to being torn from the grounded, thrown to the open air. Godfrey heaved his form forwards into the creature who had murdered his unborn child (and wife too). Without room for a scream, that monster crashed out the window, tumbling down into the city streets. The city streets below the window which sat upon a torquise tower which barely clung to a cliff's edge whose base was a mountain ten thousand feet high. Alas, Godfrey Kingdan Gitt was avenged."

-- Mrs. Gitt

On a failed save the effected creature immediately takes 1d6 bludgening damage and falls through the window. It lands prone (unless they are a tabaxi or DM rules otherwise). If the window is an ordinary, nonmagical structure (DM's discretion) then it breaks if closed, causing an additional 1d4 bludgening and 1d4 slashing damage. If open, then no additional damage accumulates from the window (though the creature may be too big to fit... DM's discretion).

Hitting the ground on the other side of the window causes normal damage based on drop height.