To date, the Eyes of Wrath extends across a multitude of worlds within the Canis Salient of the Achilus Crusade, stretching back to Spite, and as far into the front lines as Bekrin and Veren in the Greyhell Front.
At the direction of Lord Commander Sebiascor Ebongrave and Wrath's ruling Planetary Governor, Regent Castellan Hallin Tarnassus III, any Imperial force on almost any world in the Canis Salient can be subjected to intensive purity testing and be monitored for heresy or treasonous activities from afar.
Such deeds are recorded in secret and transmitted by the encrypted thoughts of Astropaths to Wrath, and from there to any other world within the network.
The Eyes of Wrath are the single greatest tool Lord Commander Ebongrave possesses for rooting out and eradicating the insidious taint of the T'au.
As all-seeing as the Eyes of Wrath are, the paranoid lord commander would be horrified to learn that they have in fact been compromised by an outside agency.
Fortunately for the Imperium, that agency is not the T'au, but the servants of the Ordo Xenos, and through them, the Deathwatch. Indeed, unknown to Ebongrave, the Inquisition has long utilised the Eyes of Wrath as a means of gathering information on both the populace of the Reach and those enemies of the Imperium who would seek to infiltrate it.
To date, dozens of T'au agents have been intercepted by the Ordo Xenos or neutralised by Deathwatch Kill-teams long before the authorities have become aware of them.
They deem it better that Ebongrave remains ignorant of the infiltration of the Eyes of Wrath, for were he to discover it, he would no doubt descend to yet greater depths of paranoia and bitterness.
- Deathwatch: The Achilus Assault (RPG), pp. 104-105
- Deathwatch: The Jericho Reach (RPG), pg. 61