So me and a friend went down the Y coordinates, went to zone 170, then 150, so half way through 15 we entered a green fog which closes the view for a long time, after we got to zone 130 after coordinates 1300 1850 char starts dying, just as you go through carson river and enter hope again.
Green fog is a big problem, and another dying zone obviously
P.S. by the end of zone 130 noticed a territory called the Nipple....