Skulls & Bones
Susandra is a High-Cleric of Zon-Kuthon who is sired from a combination of Devil and Medusa. She has displayed powers of both lineages and has proven to be a powerful cleric as well.
She created an elaborate tomb for the Alden Family, worshippers of Zon-Kuthon millennia ago. However, the Alden family betrayed her and imprisoned her within the tomb, only to be released if she was able to sacrifice a good person to Zon-Kuthon.
When Zon-Kuthon was relegated to the Shadow Plane, he used his last power to create a time-stopped demi-plane to house the tomb, thus protecting his cleric from the ravages of time, as well as the sword which is a key to his power.
Sadly, the Shadow Warriors bravely, if not naively, entered the tombs and activated the sword and freed Susandra.
The Party now knows that Susandra wields the Orb of Death affixed to the Staff, making her a powerful enemy. Surprisingly, there has been no word of her activities for some time.