when you take falling damage, by choice, you cause every creature within 15 feet of landing zone (dex save dc = 8 + prof bonus + str mod) dealing 1d6 bludgeoning damage per 20 feet of dropage.
if your size is large it's a d8, huge a d10, 1 per long rest, more then once = 1 point of exhoustion per each.
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