Unknown force is trying to get across Sarnaut some Revelation, designed to fundamentally change the understanding of the past, present and future. Worth trying to find out what this force is, what goal it pursues, and the essence of this "Revelations"...
You can start this stage by speaking with Gorislav Gipitsky at the Crossroads at level 42. It leads to Kirah. Speak with Gorislav Gipitsky at the Crossroads to complete it at level 44.
The Second Part of the Revelation states that the world that demons try to destroy is holding together by a number of unnatural powers: Meteoric Iron - the remnants of an ancient meteorite, Great Dragons - creatures from another world, and Great Mages whose power is related to Dragons.
You can start this stage by speaking with Master's Voice on the Isle of Revelation at level 45. It leads to Tka-Rik's Cave. Speak with Aidenus in Novograd to complete it at level 46.
The third part of Revelation says: Sarnaut is a prison created by Nihaz, God of Darkness, to restrain his sworn enemy Sarn, God of Light. Most of the creatures living in this world were created by Sarn with the only goal of destroying the prison. Sarn has been craving for freedom for too long. He has changed, eventually turning to the evil side.