If you're having an issue with the Red Thread of Fate quest, please try the following in order to fix the quest:
- Abandon the current Red Thread of Fate quest in-game.
- Log all the way out of the Lineage II client.
- Open the Lineage II Launcher.
- At the bottom left corner of the launcher there is a button named 'File Repair'. Click this button.
Allow the repair process to complete, and then try the quest again.