Frozen World: A D and D adventure

ADVENTURE INFO: The PCs have been asked by king Elro to drive out a gang of icey bandits who have been attacking towns near his kingdom. The gang is made up of 12 Immoths, 7 Frost Giants
and 2 Frost Salamanders. They are lead by a Immoth named Jalk. This adventure is for the 5th to 7th level.