A One-Round Living Greyhawk Bissel Regional Adventure
From the introduction:
A horrible legacy lurks in the background. If brought to bear, it could slay thousands of innocents in but a few moments. Only one person knows of its existence, but she is trapped in the most secure of prisons. Setting her free may change the way you think about your chosen profession.
A challenging Bissel regional adventure for [character levels] 2-12, and part of the ongoing War with Ket series.