Age 235
From Guild of Archivists
Gehn's 235th Age was presumably intended to serve as a sanctuary for himself and the Rivenese after the collapse of Riven. Gehn began writing the Age after his 234th Age, intended to serve the same purpose, was deemed a failure.
Nothing is known about the nature of Age 235, as it was unfinished at the time of Gehn's imprisonment in a Prison Book by the Stranger.