This was precisely Ryu's second trump card.
There were two ways to create an army formation. The first was a circulation method. They would all circulate the same technique and thus activate it when it resonated over a large enough region.
This was how things worked in the True Martial World, and this was the very same method that Ryu had used back when he was helping out Mae's Dream Asura Clan.
But in this world, they clearly used armors.
Ryu was fascinated by this, but after he put one on, he already understood how it worked.
The armor was like an extension of your Meridians, connecting to the body in a symbiotic relationship.