I've found a way to farm souls in a sustainable way as Warriors of Chaos

I stumbled upon this more or less by accident while playing Bella from the WoC.

You need:

• An undivided WoC faction (I havent tested it for the dedicated ones that dont primarily spread undivided corruption)

• A region with the province capital, especially good are the ones that are not a Dark Fortress and that have a dedicated Orderfaction set as their rebellion (Lothern is a good example)

• a few lords that can raid ( at least enough to get a rebellion every turn from the raiding public order malus )

How to do it: Get the Tzeentch and Slaanesh gifts that give a malus to public order, take the commandment that gives a malus to public order, raid the non Dark Fortress regions in the province and keep an army near the province capital to defeat the rebels every turn for your success.

I've got between 1000 to 2000 souls per turn depending on how leveled my farmlord is.