Destiny Magic Armor

I, armor, the most dangerous weapon of the Great Wall Guards. An out-of-control magic armor and a blank memory. Jing said, I am her brother, the only "key" after the family's destruction. Mulan said, trust me and use this power to protect me. But the brand on my arm has the same origin as Mulan's blood feud; the runes on my chest are dragging me towards the abyss of destruction. Ming Shiyin smiled in the court, and Emperor Jun whispered in the abyss. When the end came and the heroes gathered together, I realized - they wanted to use me to kill the gods, and the gods wanted to turn me into a new abyss. Who does this key live for?