Yes it was the Eater indeed ... I wasn't paying attention.
In the image you can see the armor ... and if you calculate it doesn't add anything to it.
And if I put it on my character , the change is proportional to the extra armor it has against my current armor.
LE: I guess the images that seaman shows above, are providing a better expplanation that nothing is happeninng when the Eater armor bonus comes to play.
LLE: Now I see what is wrong ... it is when I turn on Determination aura on that the bonus isn't working. Without it works, with, it doesn't!
Unfortunately I don't have any lesser eater to showcase what I mean, with the same item ... But the situation stands like this in my case:
ARMOR 1: 31xx armor => character 26k armor
ARMOR 2: 33xx armor => character 28k armor
ARMOR 3: 38xx armor(and 17% global) => character 32k armor
All these nnumbers are all with determination on