Exclusive to: Hamlet.
“It looks... screamy.”
“Abigail lives in the ground too.”
“HOMEPAGE OF AGGRESSIVE MOBILE VEGETATION”
“It's where those little plant guys live.”
“Ugh. That's a loud household.”
“Evidence would suggest it belongs to some sort of vegetation based humanoid.”
“I think those noisy guys live there.”
“I wonder how they get any sleep.”
“Those deafening root vegetables live in there.”
“Looks like they live below decks.”
“HATH THE STENCH O' THE WALKY VEGETABLES”
“Have you ever seen anything scream "adventure" louder?”
Mandrake Hills are Structures exclusive to the Hamlet DLC that spawn Elder Mandrakes. They can be found in the Deep Rainforest biome on the island containing the Palace. They can be destroyed using the Hammer but offer no loot.
A naturally spawning Mandrake Hill.