Need to make sure the elements tie together. The title could be "The Signmaster's Crack" or something similar. The story should highlight the significance of the link and the sacrifice involved in breaking it. Maybe the arms symbolize the connection and their removal is necessary for disconnection.

Plot Points: Maybe the protagonist discovers the need to cut their arms to break the link. They face inner conflict, physical pain, and external obstacles from the Signmaster guild. After performing the ritual, the crack appears, leading to unexpected consequences, like releasing a trapped spirit or causing a power vacuum.

Characters: The Signmaster, perhaps a protagonist or antagonist. Maybe a protagonist named Signmaster is trying to break a harmful link by sacrificing their arms. The antagonist could be someone trying to maintain the link. Alternatively, the Signmaster could be a teacher, and a student cuts their arms to break free from a link.