One Grey Hunter may take the Mark of the Wulfen

A model bearing the Mark of the Wulfen has the Rending special rule in close combat. Furthermore he replaces his usual Attacks characteristic with D6+1, rolled immediately prior to when the model makes his attacks. These attacks are made using the mark models' claws and teeth, and hence are not affected by wargear, additional hand weapons and so on, though they may be bolstered by other factors (bonus from charging, Logan Grimnar's Living legend ability, etc).