Reward for completing the optional "Lost Soul" side quest in the Whispering Woods.
Interact with the loose brick in the northern wall to find the Rusty Dagger. Use it to pry open the cell door lock. The Shadow Guard Boss Fight: demon boy saga walkthrough guide
Quests and side quests provide rewards and experience points that can help you progress through the game. Here are some tips for completing quests: Reward for completing the optional "Lost Soul" side