Regen

Worse still, a large spine of some sort would have to be removed - it had pierced his mega armour and penetrated his body. Harder than bone, the enourmous spike will not come out no matter how many Nobz Mad Dok Grotsnik has helping to pull it. In a flash of genius Grotsnik brings in Orkimedes, who suggests removing the spike via traktor beam. This does not draw out the objet, but does vacuum up a good protion of the Ghazghkull's guts temporarily, which have to be hastily reversed before he notices. At long last, with the aid of a buzzsaw and a Deff Dread with Magna-claw grips, they manage to remove the enormous spike. To everyone's amazement Ghazghkull "takes it easy" for at least an hour or two before growling orders in his normal ferocious tone. Later that day, when he headbutts a Squiggoth that will not get out of his way, everyone knows their Warlod is recovered.

WAAAGH! Ghazghkull: Codex Ork Supplement