A high level module for AD&D this one gets the players to go deep into the titular mines to get in the middle of a deep gnomes vs. deep dwarves war (or if you prefer… let me google the spelling… svirfneblin vs. duergar war, there). Going even further down they eventually get to face Orcus that you can see in the cool Keith Parkinson cover art.

Following up on what was apparently a stand-alone module (H1: Bloodstone Pass) this module, like that one, aims to also use the Battlesystem rules for fights between big armies with gnomes vs. dwarves giving the excuse for the big battles. 

The module was not very well received at the time because it felt like a bit of a jumble, with a kind of hack and slash ethos that was no longer popular in the game. It also felt unbalanced in terms of treasure and magical items which seem to be overly available throughout. These are problems that are frequent as the game gets to the later levels and one of the great difficulties in making good high level modules… which is why I suppose there aren’t that many of them (that and the majority of campaigns calling it quits around level 10).