A One-Round Living Greyhawk Core Special Adventure
From the introduction:
Every twenty years the lands of the Snow Barbarians are inundated by a strange plague of monsters boiling out of the Corusk Mountains. Their Jarls believe these incursions originate from the famed Hanging Glacier of Alisedran but to them the glacier and its surrounds are considered holy and they may not send their warriors there to eradicate this threat. The call has gone out for adventurers brave enough to dare the frozen hell of the mountains to destroy this threat once and for all.
A one-round Core Special adventure set in the Kingdom of the Schnai for characters level 1 - 15.