Go to J - 5 It’s a unmarked location and named Accursed Fighters, Archers, Crafters, Taskmasters and Berserker npcs spawn there all the time. It’s where I farm my thralls and next to it at H - 6 is were I get my T3 Accursed Bearer Thralls. It’s also a unmarked location.
I always place a round sandstone hut there with a wheel of pain in it and shoot all the ones I don’t want and use the caged stygian npc at J - 5 to knock out a T3 accursed fighter then use that to knock out a berserker so it can knock out the named ones.