The Living Book of Eschaton was the end result of Ezekial's attempt at Dion de Vermiis' Eschaton Experiment. Gathering together the Ashtani and Theran cabals, Ezekial led the group in a large occultic ceremony, binding the karma of all its members together to facilitate its gather and usage. Unfortunately, something went wrong, and both Ezekial and the experiment were lost.
Eventually, the modern day Occultists successfully enacted a ritual to retrieve both Ezekial and an unfinished Eschaton from the timestream and finished the experiment, tying their karma to that of their forebears and creating a living book in, as its name suggests, the shape of a tome that could absorb and distil karma upon those tied to it.
In the year 691 AF the Eschaton was consumed by a phoenix released by the Warlocks, after the book was used as bait by the Occultists to lead it into the Chaos Plane to assault the hordes of Golgotha.