Kai: "This weapon belongs to the 3rd most powerful kig-yar faction in the galaxy, sided with the same covenant faction that near destroyed this city. Something this fancy would have to belong to someone who is a powerful member. Unlike many kig-yar they have actually ships, the kind that can out match many modern uncs ships, 1 fighting like 3 of theirs, though that's still no where near more impressive then one can do with a sangheili ship. Only thing I know about these guys is they have some of the best gear, their perfesion is solders for hire, and they have the back bone to actually turn and attack their hirers if they are treated the way most kig-yar mercenaries are. You know, avenging being ripped off.
Unfortunately my only guess as to who this blade belong to is that I would not just give something like this to any one. I'd imagine it would go to some one who ever gave the blade to, would be pissed off to learn they are dead. Someone like a second lutenet, or a 3rd in command, or a admirals husband.
(One of the people who put them in the RP can tell you better.)