Ares simply tells Diana that he never caused the war and humanity does it themselves. Diana try to fight Ares but Ares casually tanks her attacks causing Diana to become more angry and hateful resulting in unleashing her God mod. This startles Ares.
She attacks Ares with all her power and Ares tries to block it with his sword. This results in a big nuclear explosion of divine energy vaporising kilometres of land and soldiers.
Diana emerges from the rubbles shocked at the destruction she caused. She begins too weep at her actions.
Area appears and says he is unkillable as long as war and violence exist among Humans. Diana remembers Steve's sacrifice. She vows to erase war and Violence and promote love and peace and defeat Ares.
Ares starts to hysterically laughs hearing Diana vows. Diana walks away from Ares further determined.