There's more Ghost-types the closer you get to the Mausoleum and unless we have to I don't advise going near that right now. The Old City is safer than the Mausoleum on a good day and if it's gotten this bad?

[He shakes his head. As they head down, his glowing gets more and more noticeable. Dammit.]

There's no real landmarks, just marks on the walls from patrols to guide you back to the exit. [He taps one as they pass] If we get separated, follow them.