Julian prays to Grungni, asking him to help him defeat the demon worshipers...
[Blessing? dice roll = 18. Yes!]
...for a moment, he sees an old dwarf seated on a granite throne, a tankard of beer in his hand. "Sort them out, lad," he says. Julian feels strength flow through his limbs.
[Julian is blessed: when attacking demonic entities or evil sorcerers, his attacks will cause additional damage. The blessing will last until dawn]
Julian leads Heinrich and Mortus to a manhole cover close to the docks. They open it, and then quickly descend into the sewer. They follow the main passage a short distance, before entering a minor passageway that leads to the warehouse. The passage flows on into the river, but Julian spots a concealed cover in the roof of the passage. He's able to open it, and with Heinrich's help climbs up into the room above.
He's now inside the warehouse, in a corner behind some crates. Mortus and Heinrich can follow him up.
[map again]

Klaus hears the cover being opened, and can see it from the crate he's hiding in. He recognises Julian at once, of course. Max stays put inside his crate, waiting for Klaus to tell him he can get out.