Hello,
This is the Gravity Co., Ltd. Ragnarok Online: Zero Operations Team.
Here is the information regarding the May 23 (Wed) 
Mjolnir server emergency maintenance details and server maintenance time.
■ Maintenance Time
- Mjolnir Server: 16:00 ~ 17:00 (Completed)
■ Maintenance Details
- Fix for an issue causing loss of certain items
■ Emergency Maintenance Details and Compensation (Added)
- On the Mjolnir server, game data from after the 5/23 regular maintenance (15:37) ~ before the 5/23 emergency maintenance (16:00) has been
restored to the state as of before the 5/23 regular maintenance (09:30).
We sincerely apologize for the inconvenience caused by this data restoration.
■ Compensation Related to the May 23 (Wed) Data Restoration (Added)
1. Players who were logged into the Mjolnir server between 15:37 on May 23, 2018 ~ 16:00 on May 23
-
Compensation Item:
Apology Ring Box (Rental Item) -
Distribution Schedule: Will be sent via RODEX during the regular maintenance on May 30, 2018.
@ 
Ring of Apology (Rental Item)
- A box containing 1 Ring of Apology and 1
Magnifier. Usable for 3 days after opening.
A ring containing feelings of apology.
Can use Heal and 
Teleport at Level 1. Casting cannot be interrupted.
All Status + 1.
Variable Cast Time reduced by 10%, Attack Speed increased (After Attack Delay reduced by 10%).
Type: Accessory / Defense: 0
Weight: 0
Equip: All Classes
※ The Apology Ring Box will be deleted in bulk during the June 27 maintenance.
2. 20% EXP Increase Applied on Mjolnir Server
- Period: May 23, 2018 17:00 ~ May 24, 2018 17:00
※ Please note that for cash items purchased on the Mjolnir server between 15:37 ~ 16:00 on May 23, 2018,
the person in charge will check the data and restore any lost content sequentially,
so please keep this in mind.
We apologize for the inconvenience caused during your use of our service,
and we will do our best to prevent similar issues from causing inconvenience in the future.
Thank you.
Gravity Co., Ltd. Ragnarok Online: Zero Operations Team