Vravok is the Toa of Magnetism that Xurik passed his essence to. Since his armor/power scheme(black and gold) was originated from Rahksi Ihurak, he is like a Hordika with mask power.
Vravok was originally a Matoran of Light. When Xurik gave his essence to him, he was deprived of all of his light powers, and given magnetism powers. Since Xurik's essence was a toa's, Vravok became a toa. Since then, he has had to struggle with the slightly mutated essence of Xurik and his own essence. Xurik was still alive, but he had Takaira's essence.
Vravok wears a Golden Hau, the Mask of Sheilding.