Devil Sweep

Yesterday I reached 1000 rounds in Devil Sweep, but I also found that many players don't know how this work, so I'm writing this beginner's guide.

"Sweep the Devil Union" is what it is officially called, but most of the players call it 'devil sweep', or just 'sweep' for short. It is an event that happens every Thursday at 10am server time. The event lasts for 8 hours.

To participate, click on the "castle icon" at the top left to enter the neutral city.
Next, click on the "horse icon" on the left to enter the military office.
On this page, there are 2 events listed :
1. Attack the Floating Castles
2. Sweep the Devil Union

For the devil sweep, click on the second 'Join Activity' button.
On this page, during the event, it should show the number of rounds you have completed.
There are 2 buttons 'Requirement' and 'Rank'.
Click on the 'Requirement' button, and the pop up should show you a list of devils you need to kill to complete that round. For the first round, it should show 4 different devils.

Round	Devils
1 - 5	4
6 - 10	5
11 - 15	6
16 - 20	7

It also describes the weaknesses of each of the devils :
Eg.
Dark Knight
Restraint by Lance Type Arms

That weakness is just informational, and not part of the requirement. You may kill that devil type with any troops to complete the requirement.
Now, go to the world view, find the devil type listed and send troops to kill them.

The page is cached, so if you are sure you have completed the requirement but it is not showing, get back to the town view and then go back in.

Every 5 rounds, you get a reward :

Round	Reward
5	3 x Bronze Keys
10	Silver Key
15	Gold Key
20	Jewelry Chest

After you've completed 20 rounds, the cycle starts all over again. Round 21 is the same as round 1, and at Round 25, you get the same reward as round 5. This is one good way to get keys and jewelry chest.

Beside the 'Requirement' button, there is also a 'Rank' button. On that page, the 10 players with the highest rank in devil sweep are listed. On Friday, the top player receives a Tornado Horse Yes, I am looking forward to receiving mine some time today. :) The 2nd and 3rd placed players receives an Armored Horse. This ranking is cumulative, as are the rounds described above. It means you do not have to complete 20 rounds in a week to get a jewelry chest, you can do 10 rounds each week and get a jewelry chest every other.

Have fun with this event, and Merry Christmas. :)

Additional Notes :
This is the message you get when you get the reward for ranking :

Congratulate you on being 2nd in devil attacking activity on 2010-12-23, the reward is Tornado Horse, pls attention to receive.

Note that it actually says 2nd, even though I was ranked 1st, but the reward is the Tornado for ranking 1st. Likewise, when you are 2nd or 3rd, the message will say 3rd and 4th respectively, but the reward will be correct.