How to enter the Order's underground tavern in Phantom Blade Zero

In Phantom Blade Zero, entering the Order's underground tavern requires finding the hollow floor of the pavilion in the wine yard behind the tavern building, then smashing the big black jar behind the pavilion to reveal a crank that unlocks the cellar. The location in Pangzhen is required to progress through the Town of Death quest and serves as a hub for many of the region's sidequests.