There was a bright flash of white light and a lot of heat, heat that could be felt way back where the adventurers were standing.
Even when the light and heat faded, the cavern was no longer cold. The ice was shrinking before their eyes and pooling onto the uneven cavern floor. They all moved back into the cavern and looked at the treasure. The treasure that was so enticing...that no one was looking at the exposed ledges around the sides of the cavern.