Nano armor and power armor adhere to two different development philosophies.
Power armor is more sturdy and conspicuous, suited for large-scale battlefields and breaching operations. It was first developed by Northern Military Industry. During corporate wars, tens of thousands of power armored warriors had once rampaged into the Taixi Continent; not even tactical nuclear weapons could stop them. Peace was only achieved through the armed intervention of several large conglomerates.
Nano armor, on the other hand, hugs the body and is lightweight, making it suitable for special warfare and small unit tasks. The concept was first proposed by the Lighthouse Core, while Heavenly Cardinal Manufacturing developed the first actual product.