Notification Phase
The event will enter a notification phase before the start of the event. Previews of Operation: Oblivion will show up in the Events Center

Sign-up Phase
After the notification phase, the event will enter the Sign-up Phase. Alliance leaders and R4 members can sign-up for their Alliance  
Only the Top 20 Alliances of the State can sign-up (Alliance must be older than 7 days since creation)  
A battle period must be selected during the registration phase. The battle period can be decided based on the active time frame of members. Once registered and before the matchmaking phase begins, there will be 1 chance per day to change the battle period.  
After signing up, the Alliance Leader and R4 or above members will gain access to mobilization management. They will be able to choose up to 20 members for the operation, and an additional 10 members as backup.  
When registration completed, the top 20 members of the alliance with the highest power will be automatically selected as the participating members, and the 21st-30th members will automatically be selected as backup, before the registration phase is over, R5 and R4 can adjust their participation at any time.  
Alliance members who have joined the Alliance for less than 24 hours, or whose Base is lower than Lv.16 will not be eligible for the operation.  
Mobilization formation can be adjusted freely before the sign-up phase ends.  

Matchmaking Phase
After the sign-up phase ends, the system will calculate the Alliance's MMR (Matchmaking Rating) based on the 30 chosen Alliance members and backups, then match them with an Alliance with comparable MMR.
Before the battle begins, information of the opposing Alliance will be temporarily hidden.
The server for the Clash of Alliances is now available. The system will perform the matchmaking of Alliances based on their ranks.

Battle Phase
The battle phase will be on the day of the event. The system will start the battleground based on the selected time period.
10 minutes before the battleground starts will be the preparation phase. The 20 chosen Alliance members will receive a system notification to enter the battleground.
During the preparation phase, all actions are forbidden in the battleground. Once the preparation phase ends, the battle will immediately start.
If less than 20 of the chosen Alliance members are in the battleground when the battle starts, then the backup members can enter, until the total members in the battleground reaches 20 members.(You cannot join the battlefield 20 minutes after the start of the battle)