Dwellers Amid Bones (Collector's Edition)

From publisher blurb:

Lurking in the watery depths of a fallen orc tribe's sacred burial cairn amid the bleached, broken bones of savage warriors, honoured champions and mighty warlords the forest drakes Arduthal and Ingeirmaugh have made themselves a comfortable, safe home. Periodically emerging to ravage the surrounding countryside their depredations have reached such a level that Baron Liofa Othen begs the PCs to slay the foul beasts.

The cairn's remote location, inundated, bone-choked passageways and the vengeful, possessive ghost of the orc champion Gork Shattershield, not to mention the drakes' mistaken identity as green dragons, all stand in the way of the PCs' victory.