Our Very Own Donald
The underground steam system that heats the city has failed. No one really knows why, partly because the system was constructed centuries ago and has never even needed maintenance, so no one alive knows about its workings or topology. This means that it's up to us brave adventurers to investigate.
'Why us? Do we have a reputation?'
'Ah. I did happen to spend all of our first day in the city regaling the students of the Lyceum about our exploits in getting here, perhaps embellishing them somewhat.'
'Great. We've been hoist by our own petard.'
'It's pronounced "retard".'