While indeed the Argus campaign does not affect the Legionfall follower, this short quest chain is actually unlocked by completing your Order Hall campaign.
From what I can tell you should have completed your class campaign already, so it's possible you started this new quest chain at some point but never completed it.
I'd recommend having a look at the quest chain for unlocking Nerus Moonfang to see if it helps. You can find the final quest here:
http://www.wowhead.com/quest=46045/champion-nerus-moonfang
Hope this helps!
Blindingsun
6 years ago
6 years ago
I've done the class hall quests that get me to find the pillars of creation in that raid.... ...
I've done flying so all zone quests etc
But I can't get my Legionfall follower..?
Any ideas?