Fireheart receives his 9 lives from the cats of Starclan, by touching his muzzle to the mystical moonstone, and doing so, he is able to visit Starclan in his dream. He is being accompanied by his medicine cat, Cinderpelt.
Once Fireheart's 9 lives have been given by Starclan, and earning his leader name, Firestar, Bluestar interrupts his ceremony by giving him a prophecy: Four will become two. Lion and tiger with meet in battle, and blood will rule the forest.
Upon returning, Darkstripe feeds Sorrelkit death berries (or yew berries), telling her that it was a treat. Though, once in contact with the berries, she collapses, and is taken to Cinderpelt to be cured. Once woken up, Sorrelkit tells Firestar what really happened, of how she saw Darkstripe talking to Shadowclan cats, and that Darkstripe fed her the berries so that she wouldn't be able to tell Thunderclan what he had done. For his punishment, Darkstripe is exiled from Thunderclan.