In the tundra, easy of the mountain range which is east of the City of Ice, is a stone block of a building with one door. It's surrounded by a 100' radius area of frozen, magical earth, which prevents many magical effects, and the inner half of which is swimming with underground humanoid icy creatures - giants, golems, not sure what. This is probably the lair of Keles Av Yyrwin, formerly a member of the Aertael Wizard's Council, who was driven off the council a couple of hundred years ago, and who reputedly sought seclusion and hid in the tundra.