Can someone please explain to me when does a Shadow get the 'Mask ability'. I mean, the other day I was playing Grigori (I know that they are non-religious), and when I built my first Shadow, he didn't get 'Mask'. Okey I didn't thought much of that then, perhaps just because the State religion wasn't 'Esus' (the Grigori can't even have a state religion). But now I play as the Khazads (with the usual matching religion) and now my Shadows get 'Mask'.
I remember that when I (as the Grigori) built The Eyes and Ears Network I got all (immediately) the 'Starting' religious techs and the Nightwash unit that you get with Deception he is HN, so I upgraded him to Shadow and he got the 'Mask' ability, but he instantly becomes non-HN after a turn as HN.
So when do you get the Mask ability, do all Shadows (regardless of state religion) got it? In that case if it isn't connected to state religion, why couldn't the Grigori have it? (besides the cheat with the Eyes and Ears ...) or if it is connected to 'Esus' state religion, why did my dwarf shadows get it?
I don't complaining about this, I do love my shadows (But it was strange to build them without 'Mask').
Edit: I posted it here, just in case there was someting strange going on with my shadows.