The Free OSR Dragon's Foot Resource Adventure - The Corrupt Crypt of Ilmater & Adapting It For The Astonishing Swordsmen and Sorcerers Of Hyperborea rpg System

The Corrupt Crypt of Ilmater

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Jesse Muir provides us with an old school crawl that could provide a DM with a mid point campaign adventure for any  retroclone game. 

This is a no frills dungeon crawl done in the old school tradition that can easily be adapted to Astonishing Swordsmen & Sorcerers of Hyperborea.
We get locations, a few NPC's, and two brand new monsters in this one and pretty much no background on the adventure, we're given all of the pieces to turn this into a well oiled pulp driven AS&SH game set adventure and nothing more.

Adapting this adventure 

This piece is meant to be a DYI adventure for either first or second edition AD&D with characters of either 4 through 6th level. This means for a game like AS&SH this means lowering the level of encounters back down to 2nd and 3rd level in AS&SH.
The other choice is to use existing monsters from AS&SH which is easily done. The encounters here are academic and while solid are easily adapted to your favorite retroclone game.
The rest of the adventure is easily tuned to your favorite game as well. The stats for the two or three new monsters simply need the 'Dex' adjustments from AS&SH. A bit of background into the world of AS&SH and this one is really to go. 

Using this Old School Adventure 
This is an old school adventure in the purer sense. Meaning simply adapt it as you see fit and use it as a mid campaign PC filler. The adventure easily lends itself to any number of situations and regions in AS&SH but can be made to work in really any retroclone. Because of the nature of the adventure and its monsters this one can fit the horror genre solidly if played right by the DM. The fact is that these ruins make a very nice 'Green Death' plague site that has only recently been exerting its influence upon Hyperborea once again.
A very nice little free download.