This product was originally released for Free PRG Day 2009
From the introduction:
This exploit for 9th-level characters.
A prophecy foretells of the rider of Cymbas, a horse bearing a cloven hoof, will become a plague to humanity by becoming the greatest death knight upon destruction. A young girl, named Lynn, is the present owner of the marked horse.
A cult devoted to Orcas seeks her immediate death so she can transform and lead them. As PCs approach the area of the ambush the cultists set for the girl, they hear a scream.