Hello there, can anyone recommend or suggest a good build (Stat,Skill and Items) of a Dragon Breath type Rune Knight?

I would appreciate your suggestions specialy if the build is based on kRO. Thanks. ^_^

Go for hybrid build

Hybrid
STR: 70-90
AGI: 60-90
VIT: 60-90
INT: 1
DEX: 40-50
LUK: 1
Weapon: Elemental or Carded Spears or Two Handed Swords
These knights try to get the best of both realms. By having a good chemistry of AGI and VIT depending on the user's playing style, they gain survivability in some areas while losing it in others. Hybrids are denoted by which stat is the highest. AGI-VIT Knights usually stick with a setup similar to an AGI knight. VIT-AGI Knights, likewise, generally stay with the setup of a VIT Knight.
Ranking by efficiency, players tend to use AGI-VIT combination because of its higher ASPD which allows players to do Pierce chaining or if not solo with Twohand Quicken with a decent ASPD. This build was the best for pre-Transcendent patch Knight dueling.
 

here you go :D

STR 100
AGI 40
VIT 80
INT 12+
DEX 45-60
LUK 1
(Spear-user though 2H should work as well)
Quite rare build, but should do well in MvP and PvP.
Just get yourself some goddamn STR man.

And as someone said already... don't fret out so much, Knight is only a way to reach 99 so you can transcend anyway. Ultimately it won't matter what build you have.

Starting stats: 9 STR, 1 AGI, 5 VIT, 1 INT, 5 DEX, 9 LUK

10 STR
10 LUK
15 VIT
10 DEX
30 VIT
20 DEX
20 STR
60 VIT
30 STR
70 VIT
30 DEX
40 STR
80 VIT
50 STR
90 VIT
90 STR
92 VIT

Comments: This Swordsman is designed mostly to fight in aggressive areas.
They have very high HP, and can regenerate it quick.  However, they are
very boring, as you'll hack, slash, rest, rinse, repeat, for the rest of
your RO career.  The preffered build if you like dungeons.