You can ask "Borcha" about all dark armies (Dark Pilgrims, Dark Hunters, Dark Knights, Dark Avengers, Dark Inquisitors) as soon as Ymira has joined your party, when he gets the "Eagle Eyes" ability.WarMok said:After losing the horn just ask "Borsha" companion about the where about of "Dark armies" like Dark knight & Dark hunters ... that is a hint given to me by "Secret man" in camp when I asked him about rest of gems way to find.
Plus going around killing Dark armies specially Dark Knights gives you more experience & more valuable loot.
You can ask him about the Lost Knight as well, if you have met him once.
Dark Armies in general have a lot of loot, and give a chance to drop legendary weapons, but you'll never get any prisoners.