they had that before with out having halve attacks the
in the past all monstrous creatures had ignore armor saves and 2d6 armor penetration
so it was a nerf
look in the old rule book under unit types
Aaah the past...well he past is the past and we live in the future now
GK codex was OP anyway, but all MC's got this nerf, so no moaning that GK's are the only ones
Your question was about current rules...so I provided the answer on current rules.
If you and your gaming group want to play 5th ed rules you're free to do so...but you should not ask questions about 5th ed rules then (if that was your intent? )
(Mods not meaning to backseat mod...)