This cave and series of waterfalls has long been a watering stop along an underdark tunnel. Recently a pair of ettercaps has taken up residence. They tend to stay hidden on the shelf along the first waterfall and the cave further upstream. When they see travellers that seem like easy pickings, they will leap upon them in an ambush.
A number of large and huge spiders inhabit the main part of the cave.
The cave and tunnels leading to it are heavily webbed, and a number of trip lines give both the spiders and the ettercaps forewarning of anything approaching.
While ettercaps and spiders do not gather treasure, there is likely to be some amount of incidental treasure - perhaps from https://dungeonspossums.blogspot.com/2018/12/random-treasure-tables.html
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