They drop 50 meters and they are fine. I think it should be very damaging. Anyone else think so?
It's 1d6 damage per 10 ft D&D 5e RAW (and that rule goes back to about 1e, I believe) which is close to 3.333 meters, I believe. I'm estimating based on 1 meter being close to 1 yard.
Fall damage has always been rather forgiving in D&D (in comparison to what was likely from a real fall, at least.) So, this is working as intended pretty much.
