Memento Mori

From the introduction:

The mage Spamlet the 13th was, like his previous 12 ancestors, known for his interest in the Old Ones. He was the last in his line to live in a small underground family keep. Upon his death, the keep was abandoned and the doors sealed. Recently strange fish-like and tentacled-creatures have been seen at night near the keep, causing a bit of concern amongst the surrounding population. It is said that Spamlet’s spirit is trapped in the keep and is summoning Old Ones to do his bidding. Anything a party of adventurers could do to help banish Spamlet’s spirit would be, um, helpful. Also, rumor has it that limitless wealth awaits the brave soul who destroys the mage’s spirit.