If you want a real-time strategy, role-player with bird view perspective and multiplayer, you should try SpellForce 3. It is only for PC and is available on Steam. There is no release for Linux or Mac, though.
user
{"name": "SpellForce 3", "genres": "real-time strategy, role-playing", "player_perspective": "bird view", "has_multiplayer": "yes", "platforms": "PC", "available_on_steam": "yes", "has_linux_release": "no", "has_mac_release": "no", "intention": "inform"}
assistant