Sleipnir believes that the illegible part of Captain Hinden's Letter contains important information, and he requested that you ask the archaeologist Rubelik to restore that part of the letter. After restoring the letter, Rubelik said that he thought Sleipnir's motives were suspicious and advised you to be careful. The letter revealed that Hinden and the Seiren Esnu loved each other. Sleipnir suggested using the letter to obtain the key to the Golden Trumpet Temple from Esnu. When Esnu read the letter, she discovered that Captain Hinden had not betrayed her. She was furious that Aika had tried to kill her, and commanded you to kill Aika and take her key. Esnu received Aika's Key and turned it into the key to the Golden Trumpet Temple for you. She also advised you not to give Sleipnir the key. But as you never listen to others, you did it anyway.