Disclaimer: I do not own Eragon, but I do own Rezil!
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Rezil never knew his parents, he never knew of his home. But you will before he does, he was born Alagesia, his parents were friends of Eragon, and when Rezil was one he was orphaned. That was when his parents were killed. When Eragon was about to take him Rezil disappeared, but Eragon found a message carved on the table "You lost one now but when found you will know who he is and was"