Saren

- Not, they're not part of the allegiance so no bonus - In pitched battle it's the classic amont of allied points (so 40 at 2000 points) - Yes Well, maybe the app and website are not updated but the Abhorrant Ghoul King on Royal Terrorgheist DOES NOT have the ROYAL TERRORGHEIST keyword. And it does not say that you can't take "FEC Units with the Keywords Royal Terrorgheist and Royal Zombie Dragon", only that Royal Terrorgheist and Royal Zombie Dragon cannot be taken as mercenaries. It's not written in bold and therefore it's not the keyword (which, again, is not on the Abhorrant King anyway).

I don't have the book at home but basically you can take some units from Fyreslayers or Flesh Eater Court in any army. There are some restrictions in the units you can take (thus the Royal Terrorgheist or Royal Dragon Zombie not being allowed) and you also don't earn the command point from your first turn if you have mercenaries with you. I also know that every units summoned from mercenaries units gain the "mercenary" keyword. Other than that there might be a few more rules (I heard there something link to the bravery of mercenaries units) but I only took a quick look to the book at my local store.

From my understanding you can take a Abhorrant Ghoul King on Royal Terrorgheist in your army with the mercenary system. It's 400 points and only the Royal Terrorgheist is not allowed to be taken. And it's not even the keyword that isn't allowed, it's specifically the model itself (and the warscroll with the Ghoul King doesn't have the Royal Terrorgheist keyword anyway).

Quick question about the Command Traits: if I want to play with Olynder she must be the general right? So is there a way to give the command trait that gives -2 to the enemy bravery to someone else in the army?