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In page Polyxena:

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Achilles, still recovering from Patroclus' death, found Polyxena's words a comfort and was later told to go to the temple of Apollo to meet her after her devotions. Achilles seemed to trust Polyxena—he told her of his only vulnerability: his vulnerable heel.[citation needed] It was later in the temple of Apollo that Polyxena's brothers, Paris and Deiphobus, ambushed Achilles and shot him in the heel with an arrow steeped in poison; one supposedly guided by the hand of Apollo himself.[citation needed]