All it takes for evil to triumph is for Ennui to convince good men to do nothing.
The leader of the Seven Brave inhabits this arrogant weapon.
The deadliest Sinblade, Wrathbringer is coveted by the violent and feared by all.
Pirates' many bejeweled rings and piercings actually had a practical purpose - when the pirate or sailor died, the rings could be taken off as payment for a proper burial, saving him from a watery grave. This could be tied into regional culture, or made into a quest (The Pirate's Lost Rings, etc.). Also gives treasure-seeking divers another thing to look for besides crusty old chests.