The following is a summary of what the party learned about Vecna from Jalomar’s Guide to Shalomar:
Vecna was a powerful human wizard who transformed himself into an arch-lich and effectively ascended to godhood. Thousands of years ago, he attempted to bring the whole of Shalomar under his power, but his forces were defeated by a coalition of other gods. Before the gods could confront Vecna in person, he was attacked by his most trusted lieutenant, a vampire named Kas the Bloody-Handed (aka Kas the Betrayer). Vecna lost his hand in the battle and Kas fled to some other planar realm.
Over the years since, cults of Vecna have periodically sprung up in Shalomar, attempting to restore Vecna to his “rightful place.” They have an elaborate hierarchy, in which each congregation or “organ” is led by a priest called a “Thought of Vecna.” Lesser priests are known as “Memories of Vecna,” and low level warriors are known as the “Blood of Vecna.”
Vecna is often called the God of Secrets. His other titles include the Arch-Lich, the Chained God, the Maimed God, Master of the Spider Throne, the Whispered One, the Dying King, the Lord of the Rotted Tower, and the Undying King.
Vecna’s followers have no known scripture, but copies of a text called the Book of Vile Darkness are highly prized by the cult for Vecna’s role in that work’s creation.
One symbol of Vecna is an eye with a vertical pupil.