I mean, the core is obviously drawn from the major myths, but what a lot of people overlook is how much it leans into the weirder, more obscure corners of Hesiod's 'Theogony'. Sure, you've got Zeus and Hera and all the usual suspects on Mount Olympus, but the plot really gets going with stuff like the primordial deities, the Titanomachy in way more brutal detail than most retellings, and a deep dive into the succession myths. It doesn't just name-drop characters; it builds a whole political system around divine lineage and power struggles that feels shockingly bureaucratic and cutthroat, which honestly might be the most accurate part. The author clearly did their homework beyond just the popular Percy Jackson-level stories.
Where it really diverges, though, is in the protagonist's personal journey, which is a complete invention. The book follows a lesser-known nymph's child navigating this pre-established, terrifyingly rigid pantheon, and that's where the modern novel structure takes over. The mythology provides the setting and rules, but the central conflict about forging an identity outside of divine prophecy is a contemporary character study grafted onto the ancient framework. I've seen some classicists grumble about the liberties taken with certain timelines or relationships, but for a fiction book aiming to feel epic and fresh, those changes work.
Honestly, the melding is what makes it stand out. You get the sense of scale and fatalism from the myths, but with the emotional interiority that ancient texts obviously lack. It's less a straight adaptation and more like using the original mythology as a very detailed, very high-stakes sandbox to tell a new story.