Immortals Fenyx Rising

After eons imprisoned under a mountain by Zeus, Typhon escapes, seeking to break the barrier between the mortal realm and Tartaros and remake the world in his own image. He attacks the Olympian gods, severing them from their godly essences and robbing them of their powers. Zeus flees and meets with Prometheus, seeking to secure his aid in battling Typhon. Prometheus instead makes a wager with Zeus: if Typhon can be beaten by a mortal, then he will be freed from his imprisonment. Prometheus uses his power of foresight to tell the story of Fenyx.
Fenyx, a young Greek shield-bearer of the Delian League, survives a shipwreck and washes up on the Golden Isle, where they are shocked to find that the surviving crew and the Golden Isle's residents have been turned to stone. After recovering several artifacts belonging to legendary Greek heroes and receiving a prophecy, Fenyx rescues a young stranger, who helps them reach the Hall of the Gods. There, the stranger reveals himself as Hermes, and informs them of the grave threat Typhon poses. Determined to save humanity, Fenyx agrees to venture out into the Golden Isle to restore the deposed Olympian gods, along the way befriending a 'fire bird' which they name Phosphor. Fenyx manages to restore Aphrodite, who became a tree without her passion; Ares, who was transformed into a rooster without his pride; Hephaestus, who became one of his automatons without suffering; and Athena, who was turned into a child without the ability to make clear judgments. Fenyx also defeats the spirits of Achilles, Atalanta, Heracles, and Odysseus, who were all corrupted by Typhon.
Despite their restoration, the gods are unable to agree on a plan to stop Typhon and subsequently revert to their usual bickering and infighting. Fenyx's older brother Ligyron, who escaped the petrification curse, arrives and tells the gods of his plan to steal Hephaestus' chains from Typhon, enchant them using the blood of the gods, and use them to re-imprison Typhon. The gods agree to Ligyron's plan, but Fenyx is frustrated at his refusal to bring them along. The gods, who dislike Ligyron as he reminds them of Zeus, encourage Fenyx to pursue their brother so as not to let him steal their deserved glory.
Fenyx scales the mountain at the center of the Golden Isle; at the top, they discover that Ligyron is allied with Typhon, and has collected all the ingredients necessary to create a poison capable of killing the gods. In return, Typhon will allow Ligyron to become a god in his new world and rule the Golden Isle. Fenyx defeats Ligyron in battle, forcing him to flee to Tartaros. Fenyx follows their brother and confronts Typhon, eventually besting him in battle. With his last breath, Typhon reveals that Fenyx is a demigod and Hermes' child.
Throughout the story, Zeus comes to realize how badly he has mistreated his children, the other gods, and his past lovers, and becomes guilt-ridden over his selfishness and vanity. However, he interrupts when he hears Fenyx is Hermes' child, as this should not be possible; Prometheus then admits that he had manipulated and fabricated parts of the story. He reveals that he arranged for his Titan brother Atlas to free Typhon and shipwreck Fenyx on the Golden Isle. In addition, he hid details of Fenyx's true parentage: they are actually a child of Zeus and his lover Thetis. He also tells Zeus that Typhon informed him of Zeus being behind the curse that turned humanity to stone. At that moment, Fenyx arrives with Typhon's poison, confirming the entire story was part of Prometheus' plot to have Zeus killed as revenge for imprisoning him.
Zeus admits that he wanted to destroy humanity due to their flaws, but now sees that these flaws merely reflect those of himself and the other gods, and accepts his impending death. However, Fenyx reveals they have no intention of killing Zeus, wanting instead to inspire him to be a better god and father. Typhon reappears, furious that Fenyx did not kill Zeus as planned. Consuming the poison to empower himself, he captures Zeus and taunts Fenyx to try and stop him. Fenyx follows Typhon back to Tartaros and battles him again, but they begin to lose ground after Phosphor is killed. However, Zeus manages to escape and rallies the other gods to Fenyx's aid. Working together, they are able to subdue Typhon, who is defeated for good after succumbing to the poison.
Afterward, as a reward for helping defeat Typhon, Zeus agrees to return humanity to normal, restores Phosphor as a new creature, the first phoenix, and invites Fenyx to live on the Golden Isle with the gods. Fenyx agrees, as long as they get to keep an eye on Zeus to ensure he is committed to changing his ways. Meanwhile, Zeus sends Ligyron to free Prometheus as part of the wager, but not before tormenting Prometheus by having Ligyron tell his own story of Fenyx, much to Prometheus' annoyance.