The second picture is part of a quest which very little people know how to do. Once you get to the sign it actually gives you 3 scrambled words which turn into the password for granted acess to the zorbi cave. In the cave you end up meeting an ancient zorbi wizard whoms soul has been trapped in there for a very long time.
Once you free this wizard he actually multiplies your players gralats spawn ratio by 3x , that's why you see a bunch of people who have a very large amount of gralats all the time. But the secret to gaining access to this sign and all the quest details before that have been kept a secret by a selected few for nearly 3 years now.