The PCs enter the Echo intent on tracking down Lady Dark Crane. She has taken Reita as a hostage onward and a final sacrifice. Upon entering the Echo, the PCs are immediately beset by ghosts. These ghosts can be dispersed but not slain. They are led by the ghost of the ninja dishonored by Viv. He will haunt their every step, adding Mogui to every encounter.
Beyond these, the PCs face a small army of pit soldiers barring their way deeper into the Echo. These are really just a distraction for the ten oni LDC has coopted into baring the way. The oni will drop through the cavern roof when the PCs least expect it.