DOS2:Soul of Withermoore

Soul of Withermoore is a Divinity Original Sin II quest. It is initiated upon completing the hide and seek game with Modi. In it you must free Withermoore from the stone wall in the The Lost Cell or Modi's hideout. It requires a strength of 12 to pry out the spear, and in doing so results in a spear of Braccus Rex or it can be attacked with 60 hp. You learn that Braccus Rex has trapped him here.

He tells you you can help him find his soul. In return, the player character learns of a way to get out of Fort Joy. You must head to the fortress and a switch on a statue of The Secret Seven will open a hatch. A container with his soul will be within Braccus' Phylactory Room and search for a hidden switch. This initiates The Path of the Soul method of leaving Fort Joy.