Inventing signs in DoD world

The figure (a sultan without a arm) on the left can be seen on different DoD new places, some ca contain secrets.

Cheitan Empire sultan, which name i will not say here, a name that should not be said, lost a arm. If we are to believe many people who were not yet enslaved by the Cheitan Empire. Either is true or false, the Cheitan Empire sultan, have not been seen in public.
Arab inventor Falhair Thailhalid

Besides different invented languages in a game world, there can be signs, which will give you secrets, if you can resolve them. Or different short stories, like the one above. Put them in a book, take them with you, DoD traveler.