Note 2: Assuming you don’t want to recruit nobles, you can ransom them instead in any settlement’s tavern.
Execution will cause a massive relations penalty between you and that noble’s clan. Note 1: Enemy lords captured in battle cannot be recruited, but you may (a) keep them as prisoners in your party, (b) imprison them in a dungeon, or (c) execute them. You can open the topic of discussion by speaking to a head of a clan, telling them that their faction’s ruler is not worthy of their loyalty. The only exceptions are the faction leaders themselves. Once you’ve become a vassal (or a ruler) in Mount & Blade II: Bannerlord, you’ll be able to convince lords to join your cause. Mount & Blade II: Bannerlord – Recruiting enemy lords For more information, check out our Mount & Blade II: Bannerlord guides and features hub. Note: This guide is intended for Mount & Blade II: Bannerlord’s early access stage. However, there’s a way to have enemy lords betray their own kingdom. Truth be told, most of these actions - especially those that increase your renown and influence - will lead you to unending war. In our series of guides for Mount & Blade II: Bannerlord, we’ve already detailed how to become a mercenary or a vassal, build up your clan’s rank, and play politics with the other lords in your kingdom.