there's a bit problem i forgot to mention, as you know, i had problem with unlimited quest and every quest is coming from duty scout and i tried to turn off the contact but the duty still keep in touch with them while i think better they stop gather more quest since the contact is stopped.
also, tip for you guys who want free boon, just create rivalry with unit that you wanted to dismiss or sell and when you do that, you can get free boon(positive stats) for certain week. If you do the otherwise(create friendship) you'll get trauma. so, friendship can be useful other than change the dialogue with slave. although, it'd be amazing it can affect quest succeed chance or random boon after going on quest because you send 2 best friend on a quest.
Another tips, if you had good slave but have bad traits, you can send the slave to " The Bodyswap Experiment " quest and the trait will be removed if you lucky(mostly). and if you want expensive slave, you just need devil race, they quite easy than dragon to get, but they almost as expensive as dragon. and the slave has way better traits than slaver, so try to train them into slaver. and the easiest master magic to get is water and dark, the rest is "harder". and wind master magic is only one in this game, so be careful not to throw them away.
the most painful experience is send your very expensive slave(worth 40k+) to the dragon king just to receive a tech you never used and send player to the quest without knowing that the player will be fucked in the ass/mouth really hard that makes him think like a slave.