You can say whatever you want to this post but this is true info that I have found from in game experience and reading things on forums.

This is where i got a lot of my info.
viewtopic.php?f=5&t=2551775

Intro.

spartin201 wrote:i am lvl 55 on my way to a 1v1 knight.
My build is 91Dex 40Stam and the rest into str.
People completely underestimate 1v1 knights… they are just amazing if made right! When i first started my research on 1v1knighties i looked at there weapons and only 3 out of the lvl 60,75,90 and 105(thats 8 Weapons) weapons would help an aoe knight! Knights weapons have the most attack rate out of any other classes weapons.
just because knights have a bonus on def and hp does not mean that they are stereotyped as only AOEers.
If you look at their equips many of them would support a 1v1 build.
why would an aoe knight get bonuses for attack speed, hit rate and crit rate?
thats is the real question. 
i think Flyff made knights to be much more than what people think they are.

Hope my opinion helped this conversation.

Abreviations and stuff.
-Lol = laugh out loud.
-PvP = player versus player.
-1v1 = one versus one or not aoe.
-Aoe = Area of effect which is an attacking skill to hit multiple targets.
-Str = Strength.
-Sta/Stam = Stamina. 
-Dex = Dexterity.
-Speed break is a number of dex points needed to get certain attack speed bonus.

Knights
_-_-_-_-_-_-_-_
Knights are known to be the meat shields of flyff and most the time people think that even the thought of being a 1v1 knight is stupid.
I am making this Guide not just prove people wrong about what they think but to try to show them what 1v1 knights are capable of.

Knight builds
I will try my best to do pros and cons for many types of builds.

Full Str build:
xxx str
15 sta
15 dex
Pros: 
1. Can be extremely good if your smart with how you do it.
2. Your damage will be very very very ect. high….
3. you can have "the title of Full STR FTW omgzz".
4. with Everything working right( lucky awakens and all ) you can get 100% attack speed.
Cons:
1. You need (not if you want to)but you NEED lots of money.
2. You have to have a rm on your but 24/7 (not like grinding and leveling because all classes needs e rm for leveling at higher levels besides a BP)
3. You basically only have one thing you can do… go grind…
4. Can’t use maxed rage unless you have +10 set (yes this has been tested and it is true).
5. You might die a lot.. (Might).
6. Your hit rate would be so bad you wouldn’t even be able to hit a brick wall thats 2 feet in front of you(unless you have a +10 set or super dex awakens).

I prefer not to use full str knights because there are many things that they cannot do like using higher leveled rage which is very important.

Heres a great guide for full str knights:
viewtopic.php?f=5&t=2575881&hilit=

Almost full str build:
xxx str
15-40 stam
30-40 dex
Pros:
1. Almost the same as full str but you will die less if at all.
Cons:
1. pretty much the same as full str but not as extreme.
2. you will reach the first speed break with your dex(which would mean a little more attack speed).

Dex/Str build.
xxx str 
15-40 stam
enough dex to get the 91 speed break(90 and level 92)
Pros:
1. Ok for gianting without support(thats what i have been doing and i have made 30mil+ so far in the last couple days)
2. You will never have to worry about your hit rate if you have good equips.
3. You will have a little more attack speed than other 1v1 knights.
4. Things will cost less just because you don’t need a +10 set.
5. You can totally take advantage of maxed rage.
Cons:
1. You will have a little less damage but you will make up for it with max rage.
That is really all i can think of thats bad about them lol.

Full Dex or close to it:
15 str 
15-30 or something stam
xxx dex…
Pros:
1. you might be good at pvp lol.
Cons:
1. terrible damage.
This build is what people used to do when they wanted to make a 1v1 knight.
But i think this was when you need to spam buffs to level them up and they didn’t have any greens.

One thing about all of these builds.
they are not like the only builds that you can use but they are just the most common and people have found successful.

Equips
Once you become a knight you should use recorn/rescorn until lvl 75.
At level 75 you will use full Warpon/Warspoon Forever. 
Yes you will skip level 90 and (possibly 105 too).

Level 105 ecto/extro set?
I think that the ecto set and Angels Big Sword awakened with crit rate and possibly dex would be much better than warpon, because you will have more def which could be helpful for those high hitting desert monster along with the dex bonus with ecto set (set bonus +7 dex) which would mean that you could go down to 51 dex making it so you can add more points into str(not counting if you have amazing stated gear which almost every high leveled person has now).

The level 75 set gives 15%+crit rate and 15+hit rate and that helps with hitting higher and makes it so you can use higher leveled rage with out worrying about it(more info on Rage look at skills section).

1v1 knights i think should use swords but you can still use axes if you really want to.

2h swords are naturally faster.

At level 92 I believe the 91 speed break changes to 90
Don’t ask me why.

You should always use the next highest level green big sword(until you get to angels because that is the best one you will get, don’t let that 18%+ attack speed on the legendary temp you lol.

When you get to level 75 you need at least +8 set.
Well you don’t really need it right away but it will be very helpful.
Remember +8 set gives all stats +2(DEX) and angel sword gives 10+ dex.

My build is:
40 stam
91 dex
XXX str

I plan on restating at level 92 or sooner to this:
xxxstr
15-30 stam
58 dex(because by that time i will only be leveling with a rm and i will get cannon ball) which would mean 10+dex from sword
20+ dex from cannon ball and 2+ dex from set.

You can get stated set pieces if you want to but it will cost a bit more and really is not worth it unless you are rich.
I am not sure where you would go from level 105 and up but i am not going to worry about that now.

Knights skills

I have talked about the knight skills a little bit above but i did not go into to much detail on what they do and how you can you them most efficiently.

Here is what all of the skills do but i will kind of give descriptions.
http://hinoiri.de/flyff/skills.php?class=KNT 

Guard:
This skill can be very helpful when gianting or what not.
While boosting your def it decreases your attack.
Used with rage can be a very good combo but it can be kind of confusing.
One thing that i think is very dumb about this skill is the time it lasts.
My Guard is level 5 and it only lasts for 15 seconds and it takes around 30 seconds before you can do it again(because of the cool down).

Rage:
This is the best 1v1 knight skill for sure!
You have to be very careful with this skill though.
The amount that is takes away in your hit rate can destroy you!
To unlock this this skills best potential you need that high plussed warpon set(and of course you will be using that set for the rest of your 1v1 knights life so why not pimp it out).

Pain Reflection:
I do not have to much info on this skill.
It reflects part of the damage back at the enemy that hit you.
I guess it could be good but i does not reflect very much.

For attacking skills:
it might be fun to get an aoe skill just for messing around.
its always fun to get hundreds of aibatts following you around then taking them out with just one skill^^ muhahah.

Here are some videos of good 1v1 knights.

http://youtube.com/watch?v=UekaR7V-pJc
http://youtube.com/watch?v=lB2LYf0F6fQ&feature (this one is using an axe)

This is the reason why people think 1v1 knights suck… they watch an AOE knight try to kill 1v1.

http://youtube.com/watch?v=PYY4ZHOgvB4&feature

tell me what you think so we can all learn more about this subject.

ONE MORE THING. Please refrain from saying things that are negative and that do not contribute to the conversation.
Extra stuff
*if you have more information about things please tell me.
*correction on typos would be much appreciated.

Thanks to
Anyone that corrected me.
Everyone who posted your opinions.
You guys for reading.

Credits go to spartin201.