Luke poisons Thalia's tree. He and his army of evil people who are siding Kronos wanted the camp destroyed. They said first camp and then they would move on to Olympus.
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Grover goes missing on his quest for Pan, Camp Half Blood's magical borders are dieing, and Thalia's tree is poisoned.
The events that led to the change were when the golden fleece worked too well, tharlia died and Zuse who turned her into the tree that was poisoned came back and put the gods in danger.
he is not the sea of monsters. seas of monsters is a place and he goes their to save his camp
Percy is 13 in the Sea of Monsters.
Fish. Or the reality that sea-monsters probably don't exist.