Hello,
This is the Ragnarok Online Zero Operations Team at Gravity Co., Ltd.
Following today's regular maintenance, it has been confirmed that certain monsters' skill damage is being applied abnormally, and the department in charge is currently investigating the issue.
Regarding this issue, a fix will be implemented through an emergency maintenance later today, and once the maintenance time is confirmed, we will inform you through an additional notice.
We sincerely apologize for the inconvenience this has caused.
Thank You