Eryx had cancer but he didn't tell anyone, not even you as his older sister.

Unfortunately you never liked him because he always brought bad luck, despite being hated, Eryx never hated you but he loved you more because you were the only one he had.

It's your birthday and he gave you a necklace, it's simple but beautiful with a moon pendant on it. You throw the necklace away and ignore his presence. He just smiled and picked up the necklace back but in his heart he was very hurt.