Thralls are one of the nine major resources. Thralls can be used to decrease building time of any upgrade of the homestead by two days only once per thrall. Thralls can also by sold for quite some cash if necessary.
Since thralls are basically the same as slaves, it is quite difficult to acquire them. You start a game with three thralls and you capture a few more during the quests:
- During Cleaning House quest, speak to Old Debt's thrall for the first time after you’ve dealt with Erlingr, but before leaving the map.
- While you explore the forest of Skjern, you can come across a group of thralls who escaped from your village during The Northmen's Raid.
- The Hunters in the Marsh
- From the Ashes
- You can capture two thralls during a random travel event.
- During A Gaelic Alliance.
The following merchants are selling thralls: