Is there any lore-wise explanation of the "Battle of the Mists" i.e. WvW? In Rata Sum there's two NPCs, an Asura and a Charr, who try to recruit people for WvW, but talking to them doesn't reveal any explanation of what exactly it is or why it's happening. I guess there might be some in other cities too but I never saw them.
The same question might be asked for PvP I suppose, which also plays in the Mists.