You would add 2 factions. if you join faction A you would get different benefits then faction B. If you join B then NPC's of A and players that joined A could attack you. It would divide the server and make for some fun rivaly.
Aslo each faction would have an outpost. You can get voyages there to benefit your faction but also to sabotage the other faction. the outpost would get "protection" you will be safer to sell your treasure.
