[Zuko nodded, clearly very interested as he took in this information; given the opportunity, he wasn't about to ignore the chance to pick up the trident and examine it closely. When Mukuro asked about the wall, however, Zuko handed the weapon back to it's owner.]

It's located outside the manor-- far down the path, past the forest. It's... like an invisible barrier. You can see some kind of mist or fog or something beyond it, but nothing else. I attacked it with as much of my fire as I could, and I know someone else who tried using explosives on it... it never seems to even crack.