We have confirmed the following issue.
We ask for your patience as we proceed with investigations and a resolution.

[Confirmed Issue]

■ During the instanced battle for the Main Scenario Quest “The Will of the Moon”, the target’s HP may not drop below 1%, preventing the player from completing the instance.

*There are many players who have been able to complete the instance, so we believe the issue only occurs when certain conditions are fulfilled. We are currently prioritizing investigating the cause of the issue. We apologize for the inconvenience, but if the issue occurs, please allow the instance objective to fail, then try the instance again.

We apologize for the inconvenience we are causing our players at this time.

*Updated: Sep. 20, 2018 at 5:45 p.m. (PDT); Sep. 21, 2018 at 0:45 (GMT) / 1:45 (BST)
This issue was addressed on Sep. 20, 2018 at 5:40 p.m. (PDT); Sep. 21, 2018 at 0:40 (GMT) / 1:40 (BST).
We apologize for the inconvenience caused by this issue.