Magvierak is a dead planet of the Empire. There is only one Magvierak left: Magniya King. The planet and the rest of the Magvierak were destroyed by Caraseis in the Caraseis War.
Magvierak had strong magnetic currents and fields surrounding it, and the race itself is similar to the planet. They are made out of a black metal-like material. Chunks of their body are joined by a specific magnetic force unique to the Magvierak. They are able to manipulate this field, allowing their body to recombine in varying ways. They can also influence other types of magnetic fields.