A little rushed, was still polishing a bit, but wanted to show the direction I was heading in.
[X] Plan Good News, Everyone!
-[X] Greet the gathered magisters in good cheer. Their acknowledgement of the ill rule that had permitted a festering, decadent rot to strangle the city the last few months is good to hear, as are their concerns for the proper business of trade and the plight of those in chains.
-[X] You are here to reassure them. The slaves of Tyrosh are not going to be simply freed and tossed out to starve, leaving the city in chaos. You will see to it that slaves will receive an adequate compensation from their owners for their service, suggestions for what wages to pay servants for those who are not familiar with such things, and pursuits to direct those who wish to leave their current work towards, such as your legion which already consist of many who were once in bondage. That way, even the most wayward person could be shepherded into being of use to the city, with the very few who cannot seeing justice.
-[X] Legitimate, non-slave based, trade, of course, will resume. You would not wish to see the city or it's leading citizens impoverished. Of course, there will be some disruption, but if someone is unable to make a profit with a trading vessel, surely they did not deserve such wealth in the first place.
[X] And you are glad you managed to save this city from the rot within. You excised the worst of it last night, things such as this (toss a leukadaemon head in their midst), but there might still remain some dangers, and of course there is the matter of those who opened the door to such things with their excesses and degenerate behavior.
[X] Cooly announce the arrest of the magisters from your list who are present, guarantee them a fair trial and consideration in sentencing for presenting themselves to you. Of those present, you will send a small legion detachment home with each of them to seize their documentation, explain things to their former slaves, and see that your will is carried out. You appreciate their cooperation. You will be sending much larger detachments to arrest the others from your list, to seize the documents of all who did not come, and to bring them and their families before you so that they might be similarly informed, though you will not be pleased, unlike you are with the magisters before you.