Eurytion was the son of Gaia, the Mother Goddess, and Pontus, the old sea god. He was also a primordial sea god in Ancient Greek Mythology, often portrayed as a monster. He represented the wrath of the sea and fathered countless sea demons with Ceto, earning the title Father of a Hundred Monsters. He had numerous children, most of them sea monsters collectively known as the Phorcydes. His more famous offspring included the Sirens, Graeae, Scylla, Hesperides, and others.
Typhon, meanwhile, meant "storm" or "the smoker" in Greek. He was the personification of typhoons and volcanoes, a monster or giant symbolizing storms in Greek Mythology. According to the Theogony, he was the youngest son of Gaia, the Mother Goddess, and Tartarus, the god of the abyss. He too was a second-generation Ancient God, known as the Hundred-Headed Dragon. His offspring included Cerberus, the Three-headed Dog of the Arima Caves, the Sphinx, Harpy, the Gorgon Sisters, the Caucasus Eagle, and many other monsters and deities.
Furthermore, not only were they half-brothers on their mother's side, their fates were remarkably similar as well.
One had his authority divided up and his legitimacy stripped away by the twelve Titans of Mount Othrys, led by Cronus.
The other had been imprisoned in hell and branded with a divine seal by the Twelve Olympians of Mount Olympus, led by Zeus.
Simply put, these two and their descendants had basically mass-produced the elite monsters found in every side quest throughout the Age of Gods in Greece.
Though both had long since fallen, with the revival of the Age of Gods, portions of the origins representing natural disasters and nature's will had awakened along with them. Once they encountered each other, they instinctively began competing for divine authority and domains, setting off this divine war.
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