I found the spawn, just not the right spawn.
The group returns to Chiaroscuro with the help of Mercury where they pick up Kiera, an alchemical who wishes to travel with the circle to Chiaroscuro in the Underworld. From there they return to Yu-Shan before moving on to Nexus and then crossing to the Underworld. Two days later they are nearing Chiaroscuro when they come under fire. Coming ashore, out of site of the city, the circle approaches under the cover of stealth, avoiding a second attempt to stop them, this time a zombie stampede. Once inside the city Mnemia attempts to contact her daughters through their ornament of messages, only to make contact with something speaking a machine language who directs them to a tower near the center of the city. There they learn that their imposters are still at work, they find most of the refugees and Yuki, now conscious, finds them.