Do you guys have any tips for getting Guan Yu's level 10 weapon in DW4?

6) 10th Level Weapon Acquisition
In case this is the first time any of you have attempted to get a 10th weapon,
the following are requirements for every character:
Must have Level 9 Weapon
Must be playing on HARD difficulty.

Now, Guan Yu Specifically:
Attack Power: +57
Stage: Battle of Fan Castle
Method: After Guan Yu says "Looks like we have been surrounded" and after Wu
back-troops appear, defeat Zhou Tai, Lu Xun and Lu Meng.After this is done,
you will get a "Weapon Acquired" message.

Not sure if this helps, its been along time since Ive played #4.  I do know there are actually 11 weapons though.  I have 11th for like 15 I think.  Again its been awhile.  I dont remember any trick though.  I can recommend having him as strong as possible, and equiping all the power items like attack, defense, and life.  Then go at each enemy general with a plan.  Attack at the best time, once an attack works keep attacking dont let up until they block your attack, block a lot, and never be afraid to run.  And be careful of enemy troops.  If they break your block your messed up while a general is around.  Keep at it man.

I wish. I still play DW3 a lot more than 4 or 5 for some reason, even though I own all of them. It is my favorite. I don't know why.zzzxx

I dont own it.  But I guess there is no need to ask why. lol