Simplify the following text for a Grade 9 native English-speaking person.
Original: The only thing able to rid the tree of its poison is the Golden Fleece , which is located on the island of Polyphemus ( another son of Poseidon ) , in the Sea of Monsters ( the Bermuda Triangle ) .
Simplified: The only means of ridding the tree of its poison is the Golden Fleece , which is located on the island of Polyphemus , in the Bermuda Triangle .