Deal with the Devil
Deal with the Devil is a Quest in Pathfinder: Kingmaker.
First, you will have a kingdom event about several Hellknight want to search Darven in your capital. After several days, you will have Linxia terrorize your people event, decreasing your kingdom's stats.
Now you need to go to the capital and find Darven at the south of the square. No matter what you choose to do, either agree to work with him, or try to attack him, you will need to talk to Linxia, who can be found at Secluded Lodge.
When you reach Secluded Lodge, you will find yourself been set up by Darven. After defeating the hellknights, you can decide to work Darven or not, either way, he will leave.
After a month or so, Linzi will report you about a letter from Darven, then you need to visit Brineheart.
At Brineheart, killing the Hellknights and then Darven will complete the quest.
- Siding with Darven and letting him live/build his kingdom, opens up a kingdom project which offers 5 BP per week. Also gives access to a new trader with strong equipment (+6 belts, headpieces, metamagic rods, etc) and 2 unique rings in trapped containers.