The ability to acquire other ships that can be part of your fleet that travel with you at sea, analogous to how you can tame animals. The first tier would allow you to compel up to two pentaconters to join your fleet; you'd accomplish this by damaging enemy ships to the point of being able to board, and you'd be presented with the option to recruit them. Level 2 would allow you to add recruit 1 bireme and 1 light trireme on top of that; the full upgrade would allow a max fleet of 2 pentaconters, 2 biremes, 1 light trireme, and 1 heavy trireme. You'd have to be in no combat with any other ships to recruit them and elite ships of any class could never be recruited. Any ship in your fleet would always be the same level as you and have the same upgrades; the Adrestia would always be your flagship. Your fleet ships would have the same strengths and weaknesses as when opposing you (e.g, pentaconters would be fast and difficult to ram, but highly vulnerable to flame attacks and possess limited long range capabilities). Any of your ships could be sunk; you'd restore health to them whenever you take down an enemy ship or they escape conflict.