Wave Echo Cave

Wave Echo Cave is hidden among the Sword Mountains near Phandalin.

Description
The cave is rather appropriately named for the sounds of waves that echo through it. The cave is surprisingly cold. It is also nicknamed "jack-off cave" for the sound that the jelly monsters make when they are following the Tres Horny Boys.

Flora and fauna of the cave include said jack-off jellies, some fungi that release spores in response to noise, and several dwarf skeletons.

Also Magic Bryan.