Lightweight, easy to produce and versatile, Chain was a material often used by soldiers and knights. It isn't flashy or particularly great at pure defense like Stoneshields or Noble Armor, but whatever kept the soldiers alive on the battlefield was good enough for them.
Eventually, the soldiers learned new ways to manifest the chain as defense, and from it came new martial arts and Chain weapons, with the Chain Bracelet being the Magnum Opus of this era of chain.
Used in many forms and great for fighting, it gained use not only with just soldiers but also in the general populace with many veterans who kept their service issued weapons with them.
Cheap, but Reliable. Difficult to master but intensely powerful when used at its full potential.