In the eighteenth and nineteenth centuries, Yanluo tormented China—and specifically Shanghai. He eventually banded with other powerful demons, including Baigujing, to fight against the mundanes, Shadowhunters, and Downworlders of East Asia. He became known to these mundanes as the "King of Hell."
Around 1872, Yanluo became bent on revenge on Ke Wen Yu after she exterminated a nest of Yanluo's demon litter in Lijiang. When Yanluo found a weakness in the wards of the Shanghai Institute, he burrowed his way under the walls and killed all the guards so they couldn't alert the Clave. Yanluo tied up Jem's parents and made them watch while he tortured their twelve-year-old son by injecting demon poison into his veins, causing him immense pain and hallucinations, and eventually addiction to the yin fen. After a few days, Ke Wen Yu and her husband, Jonah, were dead, and Jem was in a very bad state. By the time the Shanghai Enclave decided to investigate the Institute's silence, Yanluo had left.
- Clockwork Angel (first mention)
- Clockwork Angel: Manga (mentioned only)
- Chain of Gold (mentioned only)
- Chain of Iron (mentioned only)
- The Lost Book of the White (mentioned only)