: The discussion explains that the city's ruin and the Spectres' presence are due to the Guild of the Tower opening too many windows between worlds for trade and theft, which eventually tore the fabric of reality.
: Will fights for and wins the legendary Subtle Knife (Æsahættr) from Giacomo Paradisi, the current bearer, in a brutal struggle that costs Will two fingers—the mark of the knife's bearer. His Dark Materials 2x4
Are you interested in a or more details on how the Subtle Knife works ? : The discussion explains that the city's ruin