Cna see this one throwing up all kinds of questions in the eventual FAQ. As a non-necron player just want to have an idea about it
a) Is it disabled by glancing and penetrating hits, or just glances?
b) If I use a lance weapon, does the reduction to AV12 happen before or after you had this (eg is it 13 or 12)
c) If a necron player has entropic srike (that thing that reduces AV value, does that interact the same way? And is a vehcile destroywed when it take 11 of those hits, or 13?
d) How does it count for ramming?
Sure theres got to be more issues with this...