My gaming group and I just started playing through "The Shadow Rune" campaign with the Lair of the Wyrm expansion "in effect." I decided to use Baron Zachareth's plot deck (I forget the name right now) also. After thinking about it, I realized I might not be able to.
I know I can't use the Baron as an agent to replace an open group since he's one of the principal lieutenants but I can still use the rest of the plot deck, right?