The Serpent Rider

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Tani has waited for her bakunawa egg to hatch so she can fight beside an elemental serpent. When a monster attacks her village, she makes a bargain to save her sister Ligaya. The deal brings them closer to the Great Bakunawa, the sea serpent whose legend says it swallowed six of the world's seven moons.

Source: Bloomsbury Children's Books (opens in a new tab).