It's a snow white staff which is topped by an icy blue crystal. It's originally called Ice Staff.
Xu Xiaoyan has a mutation which is called Starwheel Ice Staff and can at night allow her to steal enemy's mobility with icy shackles around his body.
Star Staff Edit
Under the the stellar energy, it cleaned the Starwheel Ice Staff of its ice-attribute, leaving only the star-attribute. It is an evolution of the Spirit into a pure Control System Spirit.