The best thralls are T4 named purge thralls. They must be captured in a purge attack and cannot be found in the world. The best type of purge to catch these thralls is only a level two human purge. Named thralls have the highest chance to spawn in these purge waves. T4 Crafting Conan Exiles purge thralls will add the most significant bonuses and extra recipes to your stations, and T4 purge fighter thralls have the best stats.