Bloodborne DLC - Rakuyo - Weapon Demonstration
This weapon's trick mode is kind of like The Blade of Mercy, but not too much. Plus I think it's normal form is pretty awesome. And the boss who wields it was just super cool so there's that too.
Oh yeah you can apply Bolt & Fire Paper to this weapon too, which is something I didn't expect because the other 3 weapons I use don't let you.