Anton Zerbe is an Inquisitor Lord and the commissioned leader of the Tyrantine Cabal of Inquisitors of the Calixis Sector, a position he was granted by Lord Inquisitor Caidin, the leader of the Calixian Conclave himself. He does not take his duties lightly, as he believes the black doctrine of the Tyrant Star to be very real indeed.
He rarely leaves the Inquisition's Bastion Serpentis in the sector, and chairs the frequent meetings of the Cabal's Inquisitors. Zerbe once roamed the Imperium seeking out corruption and incompetence amongst the Adepta but he is now dedicated to his role.
Zerbe is never seen without his impassive golden mask and magnificent gilded armour, and he seems perfectly at home on the throne of the Bastion's audience chamber. He is not an easily approachable man and always remains distant from those around him.
Zerbe is even-handed to a fault, refusing in all cases to support one Inquisitor over another, no matter how grave an accusation may have been brought. His principal motivation is preventing strife within the Tyrantine Cabal, so that the group can do its holy work. He believes that if any one Inquisitorial faction within the Cabal was to prevail, the sector -- and likely the Imperium itself -- would be doomed.
If the Recongregators got what they wanted, the Cabal would devolve into anarchy. If the Xanthites prevailed, Chaos would corrupt the work of the Inquisition in the Calixis Sector. Even the Amalathians, if they succeeded in their aims, would drag the Cabal into a miserable, stagnant malaise.
Zerbe's objective is to prevent any one of these factions from overcoming the others in the Calixis Sector, so that the Hereticus Tenebrae prophecy might be averted. Nothing else matters. He will even go as far as to recruit new Acolytes of his own to foil one of his Inquisitors' plans.
In addition to his political skills, Zerbe is a powerful psyker, although this fact is not generally known within the Cabal. Zerbe keeps his psychic talents in reserve should he be forced to vanquish a particularly dangerous foe personally.
- Dark Heresy Core Rulebook (RPG), pg. 318