e8a898e686b6e382b5e383bce38390e383bc is a secret achievement exclusive to NieR Replicant ver.1.22474487139.... Previously only detailed in a novella from Grimoire Nier called The Lost World, Ending E has since been restored in the game proper.
Both the title and description of the achievement are in hexadecimal. When converted to text, the title becomes "記憶サーバー" while the description becomes "ヒカリガミエル", which translates to "Memory Server" and "I Can See the Light" respectively.
- Start a new game after viewing Ending D and play up to the point where Hook is defeated at The Aerie. The cutscene where Nier reaches out for Kainé's hand is altered, and a temporary save will be created where the player takes control of Kainé for the time being. Proceed through the game and choose to restore Nier when prompted.
- After viewing Ending E, the title screen will change a second time, swapping out the Lunar Tear present on the lower right corner with Emil's staff, Kusanagi, and Kainé's swords instead.
- Listen to "A Parting Greeting" in the Options menu after viewing Ending E to unlock Kainé's Sword. It can be picked up at her shack on the player's restored savefile.
- Endings C, D, and E require all weapons to have been collected before they can be viewed.