Kiyazuna

Kiyazuna the Axle (軸のキヤズナ, Jiku no Kiyazuna) is the Self-Proclaimed Demon King who created the Great Nagan Labyrinth. The labyrinth had the function of turning into a powerful, oversized golem if the Cold Star (the item that empowered the labyrinth) was taken. She is also the creator/mother of Mestelexil the Box of Desperate Knowledge.