The Tome of Uncoma is a magical book capable of bringing both the deceased and the near-dead back to life, and it along with its powers were sought after by everyone including those who wished that their loved ones returned to them, and those who would use it for power and control.
It was the main source of Abbot Thanademos's powers and the very relic behind the foundation of the Followers of Thanademos. He has used the spells and instructions from within the tome to resurrect the dead and those that were on the brink of death. Thanademos was never sure how or if the magic from the Tome of Uncoma worked and wanted to test it first.
The whereabouts of the Tome of Uncoma after the arrest of Thanademos and the disbanding of his cult are unknown.