The Way of Shadow monk's Shadow Step feature says you can teleport up to 60 feet to an empty space from one dimly lit or dark space to another. Does that include the ceiling of a dungeon?
Thematically it fits for a ninja to appear along walls/ceilings. But does "empty space" mean ground necessarily according to the rules?
Abuse case (rather than use case):
I'm playing a Way of Shadow Loxodon. I plan to Shadow Step to the ceiling above a creature to crash down on top of them with my roughly 400 lbs of Elephant-man.
Is this legal? (Yes, DMs can rule whatever, we've already figured it out for our group. I want to know if it is officially illegal to Shadow Step to a ceiling within range.)