Well, it all started a few days ago, when a few high ranking and longstanding nobles voiced their concerns and mentioned that Duke Valak might try to secede soon. Also, some of the autochthonous degenerates (Delirus included) felt that a bunch of "normal" human beings were taking over the Duchy of Outer Tilog without talking very much and without honouring the (crazy) traditions of the realm. Being paranoid and insane in nature, quite a lot of nobles plotted against the mighty duke, trying to weaken his position by stabbing him and banning his lords. That is the true reason why Delirus issued both bans. Of course, as far as he is concerned, the true reason could always be the black mead he constantly is consuming. In any way, Duke Valak proves to to be quite resistant so far.
So the plot goes on ...