Divinity Coast Bonus

Alright this is starting to get kind of frustrating ive tried this bonus misison 3 times cant get it. How many caravan villagers do you need to find before it gives you bonus? Do you need to save merchants to? Any help would be greatly appreciated, thank you in advance.

(BTW this is Divinity coast if didnt read title )

-frodre

Pretty sure there are 5 chosen you have to bring with you to Loamhurst. There's another thread somewhere about this that has a map showing you where to find them.