Shuriman Dormun Riders -- Is there any more information about them?

Hello there,

I just got an opportunity to first look at the map not too long ago (it looks really great!) and while scrolling through, I went to Shurima and saw the mentioning of Dormun Riders. There is just a short little bio about them and artwork, but they seem like they are really cool and definitely would be interesting to know more about.

Does anyone have any more information on them? They seem like such a cool thing that I don't want to pass up on.