Put some luck in general build. I am new to renewal style ragnarok and just learned that you get an attack boost from luck. Every 3 points of luck you get a 1 atk boost. this becomes more evident when str is in the 80's. it was pointed out to me that adding 3 points of luck instead of 1 str at that point is better since you get additional benefits from luck as well in regards to status defense.
I worked it out on the calc and seems that having your str at 80 and luck 30 (26+4) is the way to go for knight. work it out on your own and see what you come up with.
I just started to play around with it so I am sure that there are better combinations.
With 80 base str and 30 Luk (26 + 4) 432 - 473 Damage range
With 88 base str (-2 over stat points =P) 437 - 478 Damage range
So, damage difference is not very much at all and you get those additional defensive and offensive benefits of luck.
Just wanted to share some of what I learned recently and hope that it helps.
I had in mind something like this for knight farming build...
Str 80 + 8
Agi 78 + 2
Vit 50 + 10
Dex 44 + 6
Luk 24 + 6
Int 1 + 1 (knights are so dumb) x_X
Of course, there is no reason for you to have that much other than some nice stun shield and hp boosts. up to you if you want that or not.
I would definitely say that you should shoot for bastard sword first. upgrade that to +6 and live off of that for a while.
When you hit knight, buy the Claymore from the NPC inside knight guild over in the North East Corner. dude that looks like a swordsman. he sells it to you for 70k and a steel I believe. Only will sell it to swordy though. not merchant. then you can spend your oridecon on that weapon and level with it as knight. better than spending oridecon to upgrade a Two Handed Sword as swordy. at least for me. but I am a patient guy.
good luck to you my friend.