Thaddeus is silent for a moment, to compose his thoughts. Draco's sarcastic outburst makes him wince internally, but he does not blame the man for voicing his frustrations.
He says a prayer, just slightly louder than is required for the ritual, and a brief burst of light fills the cabin of the buggy.
"Your Highness, I know not how familiar you are with divine magicks, but I have just established what is known as a Zone of Truth within the confines of this carriage. You'll find it nigh impossible for anyone - including myself - to lie as long as it is in effect. You may test it for yourself by attempting to tell an untruth, if you wish."
He allows her a chance to do so, and then continues. "Now, I shall repeat what I have told you. I have lived my entire life of over sixty years in Ruby Keep, and I have served in the army for forty of those years. My most recent superior officer in the city was ((going to fill in after I look back in the thread))."
He continues. "Tiberious may be a tad eccentric, but he is one of the most genuine, honest, iron-willed men I know. Field Marshall Dortumn is likewise an honorable man, and he did not kill Marcallus. That was a lie, manufactured by either the Thieves' Guild or the Orphans; we are not yet entirely certain of the extent of their connection.
"In reality, Marcallus was killed by a member of one of those organizations, and Field Marshall Dortumn was framed. It seems that you have been misled, and it is a tragedy, but I implore you to trust us, Your Grace. W- W- W-
I have the best interests of the kingdom at heart."
Diplomacy (1d20+19=35)