Uh... this kingdom is 100% untrustworthy, and they're also speciist in the extreme; there is absolutely no chance you get a fair deal, and I would make sure to say so publicly and loudly; preferably right to the king's face in a public area. (And, of course, be planning to leave as soon as possible during the ensuing chaos and melée...!)
Sucks, but the only way to deal with supremacists, and those with supremacist ideals, is to utterly eradicate them wherever they are found; if you cant do that, create as much distance as you can... and then do it with help!
But absolutely do not trust them in any way, and FUCK sticking around one second longer than necessary to collect your money and deliver your "message," if you're still pretending to give a shit about that abandoned plan.
Don't pretend conqueroring the dungeon had anything to do with it, either; these lizards couldn't give three tugs of a dead Gecko's tail about that, and will absolutely claim it was done by the dead murderer that they literally sent after you... or some other heinous fuckery most foul...