When you prove victorious against a warring army in Mount and Blade II: Bannerlord, you get a handful of their forces after victory, along with the loot they were carrying. For those who are fighting larger factions and facing off against a leader of that group, you can get a lord as a prisoner.
Rather than ransom them or keeping them as prisoners, you have the option of executing them. Lords and faction leaders are the only members of the game that you can freely run. You can't do this with the other prisoners in the match. If you want to remove some of your prisoners, you can choose to free them, add them to your army, or sell them to any of the large settlements you visit.
When you want to run any of the lords you have in your prisoner's tab, go over it in the party menu and highlight the one you want to run. You should have the option available, which is the skull and bones icon when you choose the lord. You receive a brief warning just before you run them. The game warns you that this will have negative impacts on your reputation, diminishing your relationships with faction members associated with that person. This kills the game lord and you won't see them again during the campaign.
Decide if you think it's not worth pursuing positive relationships with faction members outside of this group. However, if you eliminate everyone in a faction, everything they owned becomes separate from your clan. For those who wish to get everything from a rival faction, you will find some bright spots in performing this action, but you have to go through every member of that faction. You can't get away from it.
