As the device starts humming, Vermitrax discuss the matter at hand "Although I can sound convincent enough, if this "Evil Wizard" on the other side has two neurons in his head, he'll think this: 1) Why my warlord isn't there? 2)Why are these strangers in his private, inaccessible chambers? This two items would lead him to: 3)These men have slain my minion, and surely taken his stuff 4) These persons know a fair bit of my plans to have reached so far. 5) If they examined the notes and they surly did (I did) they will know what are my next moves, and what do I hope to achieve. These reasoning would lead to either 6) I'll destroy them using my superior arcane might (Which he undoubtedly possesses if he is able to bend a dragon to his will) or 7) I'll used them and then dispose them when I have no more use for them.
So, following this argumentation, our best chance is to play card number 7) which would at least leave us unchecked for a fair bit, until we might get our hands on our objective." He points at Sharpe. "You are gifted with your speech, although it pains me to admit it. You and I will speak with this wizard, try to be as evil as you can, you'll play the leader part."