Achieve at least 500 KO Count.
Receive Ma Chao is taking the lead message over 5 times.
Finish the stage achieving twice the KO Count as the ally general in the
second place.
499 KO Count is an "A" rank.
500 KO Count and above can be an "S" rank.
But just achieving 500 KO Count won't unlock the weapon.
Immediately after game start, head to the bottom fort and fight in front of
the bottom enemy entry point, just far away enough from the entry point
captain that you don't attract him to you so that you won't have to fight
and defeat him. Enemy soldiers will come to you by themselves. Keep fighting
here and achieve twice as many KOs as the ally general in the second place.
Be mindful of the KO Count reports of your fellow ally Five Tiger
Generals.
The 1st time I tried to unlock this weapon: Ma Chao = 683 KO Count.
Zhang Fei = 450 KO Count report.
I didn't unlock the weapon.
The 2nd time:
Ma Chao = 772 KO Count.
Guan Yu = 400 KO Count report.
I didn't unlock the weapon.
The 3rd time:
Ma Chao = 484 KO Count.
Huang Zhong = 250 KO Count report.
I didn't unlock the weapon.
The 4th time:
Ma Chao = 561 KO Count.
Huang Zhong = 250 KO Count report.
I unlocked the weapon, but didn't save because I did not understand fully
and wanted to do some more testing.
Then after some more tests, when I was almost certain of the conclusion that
getting twice the KO Count as the ally general in the second place will
unlock the weapon, this result broke the rule:
Ma Chao = 928 KO Count.
Guan Yu = 450 KO Count report (2 seconds before the end of stage).
I did not unlock the weapon.
So I did some re-thinking, and started taking notice of the who's taking the
lead messages. So I started counting.
Test 1:
Ma Chao in the lead = 8 times (734 KO Count).
Zhao Yun in the lead = 0 times (250 KO Count).
Guan Yu in the lead = 2 times (200 KO Count).
I got the weapon.
Test 2:
Ma Chao in the lead = 6 times (585 KO Count).
Guan Yu in the lead = 1 time (250 KO Count).
I got the weapon.
Test 3:
Zhang Fei won.
Test 4:
Ma Chao in the lead = 4 times (775 KO Count).
Guan Yu in the lead = 1 time (300 KO Count).
I did not get the weapon.
Test 5:
Ma Chao in the lead = 5 times (585 KO Count).
Zhao Yun in the lead = 1 time (250 KO Count).
I got the weapon.
Taking all the above test results into consideration, I arrived at my
conclusion. Do this on Expert Mode
Get 800 kills in Hard Mode
On hard mode get 50 kills in 4 minutes
Get 100 kills in 3 minutes on hard mode
Achieve 300 KO Count in under 4 minutes on hard.
Get 100 kills in 6 minutes and 35 seconds on hard mode
Get 300 KO Count in under five minutes and win with the difficulty on hard
Achieve 100 KO Count in under 4:30 minutes on hard.
Don't let any one pass the bridge and kill all generals on hard
Kill Cao Ren, Zhang He, Xu Zhu and Xu Huang on hard mode
On hard mode, get 400 KO Count before Xiahou Duns reinforcements comes
Before your ally troops get eliminated, defeat Guan Xing and stop the rock attack on hard
Beat Hua Xin, Hua Xiong and Lu Bu in under five minutes on hard