Inquisitor Messalina
There is, of course, no such thing as a Traitor Inquisitor. On the other hand there are Radical Inquisitors, some of which can be reclassified by their peers as Rogue Inquisitors or even Excommunicate Traitoris.
But, by their own lights, they are not traitors.
One such is the Radical Inquisitor, Messalina. An Ordo Malleus Horusian, she believes that Fabius Bile;s cloning technology holds the secret of merging warp power and biology to create a divine avatar for the resurrection of The Emperor.
So she and Fabius are nominally allied in their research into 'superhumans but obviously each intends to betray the other at some point. The question is who will be quicker of the draw.
Weapons
Messalina is equipped with a power stave and a high compression sprayer loaded with highly toxic and corroding chemicals laced with unstable lethal viruses (i.e. a flamethrower). She has been busy in Bile's laboratory.