This is just a tidied up version of Vandal, the extra-dimensional barbarian who used to be accompanied by another character named Warlock. Well, that guy’s gone.
The creepy and nefarious Vox managed to use his powers to get inside Vandal’s head and coerce him into killing the warlock.
Vox took control of the chain that controlled Vandal for a short time until interference from Phoenix broke the bonds that held him.
Now Vandal is on his own for the first time and without someone to control him, there’s simply no telling now much chaos the barbarian may cause.