Fun weapon? The only fun weapon I can think of is Nightblood! Erm.....that one boatsman who fished Nightblood out of the water and Vivenna finds Nightblood and they go to rescue Vasher from Denth?
I'm just gonna randomly guess even though I don't really know the clue... Wayne's dad. I need to reread Mistborn Era 2, I'm sketchy on some details, I know!