Thalia Grace is the demigod Daughter of Zeus and the mortal woman Beryl Grace. She is the elder sister of Jason Grace, whom she raised for the first two years of his life. However, she later ran away from home when monsters started attacking her. She made her way to Camp Half-Blood and met Luke Castellan, Jasper Rhodes, and Annabeth Chase along the way. As they approached the camp, monsters caught up with them. Thalia sacrificed herself to give the others a chance to get to camp, and Zeus turned her into a pine tree as she died, preventing Hades from punishing her soul.

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