The Obelisk Gate follows Essun as she shelters in an underground community and learns how to use a giant network of magical obelisks to catch the moon and end the seasons forever. Meanwhile, her daughter Nassun arrives at a new village where she forms a close bond with a protective mentor and learns to become an incredibly powerful magic user. As a rival army attacks Essun's new home, she is forced to unleash the devastating power of the obelisks to protect her people.