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Public entertaiments, hunting in marsh or coast for high lvl slaves then selling in sguild or in amber for 2x price(bc of bugged cost when slave is rebelious and u open selling window), regular quest where u are looking for "rich" grade slave(always good), also for start good quest for looking for humanoid female with N hair colour, mb remember smthing else later.
Not sure what you mean by "Slaves diminish the mood of the initial subordinates.", as there are no mechanics in the game that match that description.
The key to making money as a hunter is rescuing people from bandits and monsters, then ask for a reward. Be sure to have good reputation in the area.
Work causes stress rather than effecting the slave's mood. So long as there aren't other sources of stress it shouldn't build up much for most jobs. If it does then a sundress, a day of rest, a private room to sleep in, or casting sedation are simple ways of dealing with it.
I also recommend Public Entertainer job with sundress for stress relief, because agility is great for the job and for fighters.
i dont know what ppl are using, but you can do less great things
go visit shaliqe village and go to fairy grove forest or to sea and catch rare uncivilized races 200+ per unit possible to beat without big casualties
requires some patience, i usualy got 300 for fairy and use it to afford training/lab upgrades erly
afaik Sea and Fairy grove should not have ambushes, but never tryed to go there with level 1