The references I took for the sword, with the visual identity of The Last Reality being strongly incorporated for the sword design.

Dynamic Device: An alien sword of astonishing power capable of move by itself according to its own will (due to its special energy source) and under the command of its user when its wielded.

Coming from The Last Reality (alien dimension responsible for the destruction of uncountable realities), that sword is made of high technology together with the properties derived from a cube (sentient and dark power source of The Last Reality). It can move by itself, either to attack or to choose a wielder of its interest, contains the powerful energy of the Cube which can be used violently, and has the power to corrupt and control whoever wields it, turning them into a loyal acolyte of The Last Reality and under The Queen's orders.

Front and side views of the sword and its final layout