Nick Horth’s Age of Sigmar book City of Secrets, set in the city of Excelsis in the realm of Ghur, was the first to deal predominantly with mortal characters rather than Stormcast Eternals. Armand Callis is a corporal in the Coldguard, one of only three Freeguild regiments left behind to defend Excelsis while the majority of its forces march to deal with a vast gathering of Orruks. After stumbling upon a sinister plot and accidentally experiencing a powerful prophecy, Callis finds himself working alongside the Witch Hunter Hanniver Toll as they race against time to prevent the city’s destruction.