Assassin's Creed® Odyssey - Recruit leaders, polarchs and mercenaries for ship

Never kill leaders, polarchs or mercenaries. Recruit them for your ship. If they are not strong, you can send them away. Do not worry about recruited mercenaries, even then they are indicated as murdered in your mercenarie menu but they are available as a ship crew ASSASSIN'S CREED ODYSSEY https://store.playstation.com/#!/nl-be/tid=CUSA09303_00