We continued through the sewer. Found Killjoy, companions and a giant trained squid like creature in a final room. After a bit of chatting they attacked us and all died in combat. The group learned that the assassin was probably hired by the king of Terminia to take our his mother Nira who had likely been traveling with Anselem the Zateal formula researcher. The group then left the sewer through a surprisingly convenient invisible exit. One of the halflings got away.