Needs to be completely re-written. Original explanation below.
Armor made specifically for Nyte. It was made to hide his identity, and like his physical body, can be imbued with motion magic. Also, the state of the armor reflects the state of his body. A cut on the armor represents a real cut. The armor can be regenerated at the price that Nyte can not move while it does so (in other words, sleep.) The armor can only be opened by yelling the Seal of the Butterfly, which will partially destroy the armor (the helmet, and the back). This Seal is released by Nyte to save Kyle during the war between the Desert Kingdom and the Psi in Tale of the Psi