Den

Led by Salivar

Used to be dragons. Was ashamed of what they did during the Chittery wars so they bound their wings and retreated undergrounds. They were the possessed by the primordial of other. They introduced building. Composite assembly. Alloyed metals.

The serpents bind themselves in indestructible chain mail. It's not armor, it's a permanent bounding. A few younger serpents are justifiably mad about this and Baylore can make one his apostle.