Enemy players won't be able to attack you but the city guards will. And if you fight back you will activate PvP mode, making you a target for enemy players at that time. May I make friends of enemy faction players on a role-playing realm?You can try to make friends with some enemy players, so they will not attack you. But that will not stop other opposing faction players from attacking, and the NPCs certainly will not become friendly. Even area effect spells from "friendly"