"And Arathinos brandished the Foe-Reaper, and let loose a battle cry. He stood, with rain pouring out of the heavens, on a mountain of bodies. The rain washed the blood through channels in the corpses. Arathinos raised the Foe-Reaper and saluted the fleeing enemies before him, as lightning crashed around him.
The Foe-Reaper is a great blade. With the years spent in Arathinos's hands, it has taken up a myriad of powers. And most prominent among those powers is dramatic effect. What is more morale-sapping than seeing your enemy with a backdrop of lightning, as if the arrows of the heavens stand with your foe?"
MADDS - the impregnable Planetary fortress system of the 25th Century
The six demonic legions are extremely structured compared to their seemingly chaotic nature. While to the outside, those looking in to the hate and rage filled beast of nightmares all that is seen is a lust for blood and death and suffering. While that is true to some degree it is all for a purpose and all for a reason.
This is a detail of the structure of the demonic military ranks and their leaders.
The tradition of Battle Sashes is only a century or two old. It started in Celedor by the River, but it has been adopted in every part of the WestLands. Now the complex code of knots and colors allows Elites to know "who is who" as well as their affiliations.
There is a land where every person wears spectacles. Those without eyeglasses are considered to be the lowest stratum of society, so adventurers without glasses are treated like outcastes. It certainly would explain those heroes wearing sunglasses for no apparent reason...