“Uncle” Hari left this minor fortification to his non-relative heirs upon his death. It consists of a wall, a couple of buildings, a gatehouse, and a few underground rooms.
I will post the maps when you are done with the adventure.
The keep earned its name during construction, when the workers had to clear out a thick bramble that seemingly regrew at night after a full day of hacking and sawing. They eventually resorted to burning the thorny growths away, which worked only half as well.