“ Trying to find a place for this...
'After the famine hit the land, the priest Galen began religious wanderings, drawing his congregation to follow him. Those who took up with him, began to walk, a great outpouring of energy to this religious pilgrimage, coming from an impoverished nation with no true direction other than to find relief. Galen professed to his followers that they would find great resources set by his God down on Earth for them, enough to nourish and slate their thirst. Those that fell as he took them across the barren plains of the western reaches, rose again to join the lines. When finally all had died, Galen led them further, praising Nuh-Erell for that first city they came upon and a feast of flesh that lay in wait'”
“ Near a major city, a mirror image of the place has appeared. This strange double is infested with hostile insectoid humanoids that appear to match the city folk in numbers and armaments. The humans' diviners have determined that the secret of the city's appearance can be found within the double's college of magic, so heroes are needed to explore within this mirror city and discover what has drawn it from its distant realm. There isn't much time to spare, as the bug folk find their mammalian counterparts unnatural and blasphemous, and plan to destroy them.”
“ A casual remark by one of the party about something met on a previous adventure leads to a summons to and grilling by the Mages' Guild (or equivalent), probably resulting in an expedition back to that area to recover the things for study by the Guild. The party's presence will be 'requested' for this expedition.”