The real Ares the God of war appears . He tried to convince Dana to join his side , for a second Diana wanted to join him . But she didn't join . She fought with him even though she was weaker than him .But she remembered Steve and her friends , she went to are with furious anger and fought too hard until she killed him.
After she won against Ares .She never went back to her island (Themiskira).She went back to London and started a new life there.