Wonder Woman engaged the First Born, but he quickly gained the advantage and attempted to kill Zeke. However, War challenged the First Born to a fight while Wonder Woman recovered. Then, Wonder Woman grabbed a spear and impaled both Ares and the First Born. As he died, Ares congratulated Wonder Woman for being a great warrior. Wonder Woman spared the First Born's life and went with Hades to take Ares' body to the River Styx.
Before she was Wonder Woman, she was Diana, princess of the Amazons, trained to be an unconquerable warrior. Raised on a sheltered island paradise, when an American pilot crashes on their shores and tells of a massive conflict raging in the outside world, Diana leaves her home, convinced she can stop the threat. Fighting alongside man in a war to end all wars, Diana will discover her full powers…and her true destiny.
“I have the good Sergeant’s letter in which he expresses his enthusiasm over chains for women—so what?” As a practicing clinical psychologist, he said, he was unimpressed. “Some day I’ll make you a list of all the items about women that different people have been known to get passionate over—women’s hair, boots, belts, silk worn by women, gloves, stockings, garters, panties, bare backs,” he promised. “You can’t have a real woman character in any form of fiction without touching off a great many readers’ erotic fancies. Which is swell, I say.”
Although they do not appear in Justice League: War, the Olympian Gods are briefly mentioned by Wonder Woman during a conversation with Superman about the other five heroes, referencing Batman as Hades (who is just as dark and mysterious just as Maxie Zeus did in the "Fire From Olympus" episode of Batman: The Animated Series), Green Lantern as Apollo (the God of Light), Flash as Hermes (the Messenger of Olympus and God of Speed), Cyborg as Hephaestus (the Blacksmith of Olympus and God of Metal) and Shazam as Zeus (God of Lightning).
She also had an array of mental and psychic abilities, as corresponding to Marston's interest in parapsychology and metaphysics. Such an array included ESP, astral projection, telepathy (with or without the Mental Radio), mental control over the electricity in her body, the Amazonian ability to turn brain energy into muscle power, etc. Wonder Woman first became immune to electric shocks after having her spirit stripped from her atoms by Dr. Psycho's Electro Atomizer; it was also discovered that she was unable to send a mental radio message without her body.
Upon becoming a super-heroine, Wonder Woman became a founding member of the Justice League. Her ambassadorial duties required her to visit Washington D.C., with army officer Steve Trevor as her liaison. When Parademons stormed Metropolis, Wonder Woman resolved to defend the city, meeting the heroes Superman, Batman, Flash, Green Lantern and Aquaman. They also met the young hero Cyborg, who attempted to warn them against the evil alien conqueror Darkseid. Unfortunately, Cyborg's warnings were meaningless, as Darkseid had already arrived. Although Darkseid had initially beat them without effort, Green Lantern rallied them in order to confront Darkseid as a team. Wonder Woman proved crucial in Darkseid's defeat, stabbing him in one of his eyes to prevent him from using his Omega Beams. This gave Superman and Cyborg enough time to throw Darkseid back into his home-world.