Once the shipment arrives at the kingdom it seems that all the boxes are empty and for some reason most of the coins were replaced with small rocks and acorns.
"The gods have chosen to smite us today my brethren...but we must fight back"
"How damn it we're just men...insects before their power"
"We will have to find the dagger"
When was the last time a character caught a cold or flu? Real people get them every now and again even with solid heating and dry interiors. Your characters are out in the cold and wet, and even inside is not always dry and warm. Imagine having to stop your dungeon crawl, sitting in a tight defensive position, while you all are feverish.