Mists of Madness
The Mists or the Mists of Madness are the Mists that encircle Gemnos. Whether you go north, east, west or south, you always end up at the Mists, and if they engulf you, you either never come back out, or you come back out insane. No one has been able to gather further information about the Mists. They are one of the great mysteries of Gemnos, and no amount of magical scrying or divinations have been able to pierce it’s secrets.
Sometimes weird monsters that are otherwise not native to Gemnos come out of the Mists to wreck havoc on the communities nearby.
If you go deep underground, the caves and tunnels also eventually fill up with the Mists. There is no way around them, Gemnos is inside them.