Create Sorcerer background

'Summer heatwave' seems like a rubbish explanation for why the caves are melting, so I'm proposing that a sorcerer cast spells to keep the Ice Caves cool, and to make the dragon sleep.

Now he has died, so the Ice Caves are melting, and the dragon slowly wakes.

Also, maybe the dragon could be on display in Room 7? It would mean the PCs must go past it every time they go past the entrance, but can't attack it unless they want to pull that ice apart...which would free the dragon.

Also, room 11 contains a narrow passage. I don't know if a dragon could actually fit through there.