This. This would be perfect. Weapons that powerful, legendary, wouldn't be able to be usuable forever. But, stick them in an instanced dungeon, and have various party members take turns using it. At the end of a fight, you'd have to return the item, or give it to a destiny's edge member, or something.
Hell, make it so it's the only thing that can damage a boss, and the rest of your team has to fight off minions or something, and you have to 'pass the sword' when you have a shot to hit the boss.
I have ideas....
Interesting ideas, though I do hope they plant plenty of seeds hinting to the weapons arrival before it does.
That's the part I'm trying to stress here, legendary items should feel legendary
I remember hearing some people talking in Gchat about the Ashbringer when I was still a helpless scrub in WoW, and I was like "Ooooh Whatz teh Ashbringers!!11" (I was like 11..playing on my cousins account >.> So that's probably a horrifyingly accurate reenactment of the dialogue <,< ) and the reply was "We don't really...know. Its kinda of a mystery" and from that day on, Azeroth really "clicked" to me, I can't explain why, but it was something I was proud of knowing, I knew the Ashbringer existed, nothing else, but It was still awesome to have legends like that in-game.