Border Defense Wars are held in 7 different categories:
| Category | Levels |
|---|
| 1 | 20~29 | | 2 | 30~39 | | 3 | 40~49 | | 4 | 50~57 | | 5 | 58~64 | | 6 | 65~72 | | 7 | 73~77 |
There are different number of events per day in different versions. In USKO there are 7 events per day, while in JPKO there are only 3.
When the time comes, a small window will appear on your screen. Click on the "Join" button in the window to sign up. After a 10-minute countdown, parties are teleported into instanced dungeons one by one, starting from the low levels. This means that the high levels might have to wait 20 minutes before being teleported in.
It's possible to win the Border Defense War in two ways. First, you can capture the center monument by right-clicking on it, and holding it for a certain time will result in winning. Second, the first team to score 50 points (levels 20~57) or 80 points (levels 58~77) wins. If there's no winner after 30 minutes, the winner is determined by the amount of points gained.
The rewards for the event are EXP based on your score in the war, Red Treasure Chest, Abyss Gem, Border Security Scroll and Certificate of Victory. The EXP formula is (Level-20)*(30000+Score*1000) for levels 40~57 and (Level+55)*(20000+Score*500) for levels 58~??? (not verified for low levels). Losing score is the same multiplied by 0.7.
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