The Brumal Realm

From publisher blurb:

The first fourteen levels were only the beginning!

Confound your players with a whole new level to add to your Castle of the Mad Archmage™ adventure. Level Nine West presents a frozen wasteland with gates to the distant past and a deadly battle between the forces of Good and Evil into which the player characters stumble.

This module features 64 new encounter areas and 5 new monsters, a full page map, plus new magic items, an explanation of how this module fits into the whole Castle structure, and the impact it will have on the inhabitants of the central ninth level of the dungeon. There are also tips for game masters who would like to run this level as a stand-alone adventure.