Hey all. Let me first start by saying that my and my friends are having a blast playing this game. In fact, whenever my gaming group gets together, we are either playing this or Twilight Imperium. I am the owner of the game, so by default I am almost always the OL. I am also in the process of collecting all of the Lieutenant packs and have so far have Valyndra, Elisa Farrow, Merrick Farrow, and Zacheriath (sp?).
Now, my question is this: Why is it that I am not allowed to play Zacheriath as an Agent or use his plot deck if our group is playing the Shadow Rune campaign? The only answer that I can find is that it is because the campaign's story has a plot twist or two involving him. But to be quite honest none of us really care about of the "story" of the campaign. So, other than for storyline reasons, is there a game balancing/mechanic reason why certain Agents (like Zach) and banned from certain Campaigns (like Shadow Rune)?