"Puppets dance in the dark" "A pursuit of dainty steps" "From whence loyalty drives" Spoiler Warning: Plot details follow. Read at your own risk. The Echoing Library is the fourth labyrinth that is found in the Cloudy Stronghold. Upon obtaining the Black Flame from the Windy Archive you're able now to explore the rest of the Stronghold, though the Imperial Prince has made off with the Medium deep within the Library.