My question is how do you know your doing the right Faction Leves to get to the NM one?
It's the "Special Mission: " leves.
Not all "special mission" leves end in a NM fight.
The ones under "The Horn and Hand" which starts with "Poaching the poacher"
Do not End with a NM or even a chest for that matter and are clearly designed for pure DoH/DoL classes.