P. 102, First sentence of the Talent's description reads:
"The character's knowledge of engines and their machine spirits surpasses that of the hidebound savants of the Omnissiah and their blinkered thinking."
This doesn't seem quite appropriate, considering the only possible PC user of this Talent in Only War is one of these "hidebound savants of the Omnissiah".
It's doubly inappropriate considering it's a direct copy-paste from the same Talent's description in Black Crusade, where it served the Heretek characters.
I'd suggest rewording that part