Dorian knows Iorveth knows, he just . . . let Una get the information for him and waited for her to pass it on. Because that was way more fun. I AM NOT SURE HOW HE COULD GET IN. I would like him to though! He's invested in this. If he in any way heard it through the grapevine he'd possibly seek Iorveth out?

Actual skillset: he's already gotten lost in done unpermitted explorinatin' in the palace before, which I guess is helpful. Oh and if anything tries to kill them all you can toss him to it as replenish-able bait, hey.