Any Noble captured in combat or through Noble interactions, is held in the Dungeon of the player that captured them. This player has 3 options:
  • Release, returning them to their home keep right away
  • Ransom, sending a request for resources in exchange for the prisoner. This is done via the 1:1 chat between the two players and can be negotiated. If accepted the ransom is paid and the Noble is released
  • Torture, adds a trait to the Noble that lasts for some period of time. Tortured Nobles can not leave their Keep (so can not lead armies, explore dungeons, trade, visit other keeps etc). 
The "Torture" action is available only for Conqueror role Nobles and is unlocked with their talents. To Torture, have them interact with one of your captured Nobles located in your Keep's Dungeon.