Exclusive to: 
“Smells like a million giant bats.”
“Ugh! What a smell!”
“Is smelly like flappy bad guys.”
“Smells like death itself. And bats.”
“ERROR: OLFACTORY UNIT IS OVERLOADING”
“I believe there are bats within.”
“Smells worse than my long underwear in there.”
“Rather dreary. I like it.”
“Evidence suggests it keeps the ceiling up.”
“Föes dwell within!”
“Hello...Anybody in there?”
“Looks pretty creepy.”
“Ugh. Not very aromatic.”
“Arr. Tha flyin’ devils be within ye.”
“HATH THE FLYING RATS WITHIN”
“Hard”
“If that comes down, the whole place could collapse.”
The Spooky Hole is a Structure exclusive to the Hamlet DLC. It is a large cavity present in the middle of every Cave Cleft.
Although many of the examinations quotes would imply that it spawns Vampire Bats, the Spooky Hole has no known functionality and cannot be destroyed or interacted with in any way.
