MarkB
Legend
I tend to the opinion that incredibly powerful magical weapons should NOT have their inherent weaknesses taken away. The party is generally capable of destroying or at least throwing such things away if they become a problem.
Well, the sword is going to spend most of its downtime in that scabbard. Maybe it'll turn its attention to influencing it, leading to either the sword gaining the ability to cast Silence as an area-effect at the most inconvenient times, or else the scabbard eventually becoming an evil, intelligent, talking scabbard of silence.