The third mission in Assassin's Creed: Odyssey Fate of Atlantis is called A Lover and A Fighter. This quest is received from Hermes.
A portal will appear once you defeat the opponents. It can take you to Greece.
Once you're up there, use Wings of Hermes. This is a new means of transport that will allow you to quickly travel extended distances.
Wings of Hermes are marked on the map - you can easily find them. Using Wings of Hermes my switch a short loading screen.
Once you use Wings of Hermes, talk to Hermes and Adonis. Your new task is to cripple Persephone's control in the area.
Travel to Fortress of the Three Sisters. Once you're up there, kill three captains, burn three provisions, destroy three torches, and find four treasures. Once you clear the area, you'll receive information regarding the location of the commander.
Once you get the information, kill Aegea the Amazonian Queen.
Return to Adonis. This will end the mission.