In Dark Heresy 2nd Edition, Forgotten Gods p. 55, there's a tech priest who is looking for a device called the oculus ignis.
There's no other references in the other lines as to what the device is, and the only thing I've got so far is that it means roughly "the eye of fire"
So what do you think it should do?
No lyn, dante, or weasels, i don't plan on using it for you guys.