I think the bigger problem is that RAW suggests that even tacked onto a magic weapon, a RotWM still needs its own separate attunement.  Or if you just want a magic sword that doubles as an arcane focus as a more custom item, it's certainly not a bad idea, and hardly gamebreaking.<br/><br/>As for me, for my "Oh dear god why?!" item, I'm debating between a Holy Avenger and a Rod of Lordly Might.  Both feel thematically fun for Panera, but I can't decide which is better.<br/><br/>That or a Deck of Many Things and see how fast everyone hates me!  :P