This room's floor is coated in a thick layer of snow and sleet. The walls are thicker and the doors heavy, with metal bands. It was designed to once house the guests of the Mozz who were from the arctic regions of the world; or who were more comfortable in a place as cold as the grave.
It's also been a very long time, and since the previous ice-age of the world, this room is very out of tune for the winters of today. Whenever you enter this room, roll a 1d6 to see how cold it is. For each point above 3, take a point of temporary Maximum HP damage until you can warm up.
In one corner of the room, a sheet of permafrost covers the corpse of a few would-be explorers, clutching something shiny in their hands. It would take either a powerful fire spell or several hours with ice-picks to break it open. Inside is a sack of golden marbles worth about 400 gp.