Here are the skills of a Dragon Knight and what they do at certain levels
during growth.
**All skill tables were cited from www.hidden-street.net**

Element Resistance  Master Level: 20
You get additional resistance from Fire, Cold, Lightning & Poison.
Level 1: 12% resistance against magic attacks
Level 2: 14% resistance against magic attacks
Level 3: 16% resistance against magic attacks
Level 4: 18% resistance against magic attacks
Level 5: 20% resistance against magic attacks
Level 6: 22% resistance against magic attacks
Level 7: 24% resistance against magic attacks
Level 8: 26% resistance against magic attacks
Level 9: 28% resistance against magic attacks
Level 10: 30% resistance against magic attacks
Level 11: 31% resistance against magic attacks
Level 12: 32% resistance against magic attacks
Level 13: 33% resistance against magic attacks
Level 14: 34% resistance against magic attacks
Level 15: 35% resistance against magic attacks
Level 16: 36% resistance against magic attacks
Level 17: 37% resistance against magic attacks
Level 18: 38% resistance against magic attacks
Level 19: 39% resistance against magic attacks
Level 20: 40% resistance against magic attacks

Buster  Master Level: 30 (USE FOR SPEAR ONLY, IT ALWAYS STABS)
Attack the enemy several times with the spear.
Level 1: MP -10; Basic attack 55%, attack 1 enemy 2 times
Level 2: MP -10; Basic attack 60%, attack 1 enemy 2 times
Level 3: MP -10; Basic attack 65%, attack 1 enemy 2 times
Level 4: MP -10; Basic attack 70%, attack 1 enemy 2 times
Level 5: MP -10; Basic attack 75%, attack 1 enemy 2 times
Level 6: MP -13; Basic attack 80%, attack 2 enemy 2 times
Level 7: MP -13; Basic attack 85%, attack 2 enemy 2 times
Level 8: MP -13; Basic attack 90%, attack 2 enemy 2 times
Level 9: MP -13; Basic attack 95%, attack 2 enemy 2 times
Level 10: MP -13; Basic attack 100%, attack 2 enemy 2 times
Level 11: MP -16; Basic attack 104%, attack 3 enemy 2 times
Level 12: MP -16; Basic attack 108%, attack 3 enemy 2 times
Level 13: MP -16; Basic attack 112%, attack 3 enemy 2 times
Level 14: MP -16; Basic attack 116%, attack 3 enemy 2 times
Level 15: MP -16; Basic attack 120%, attack 3 enemy 2 times
Level 16: MP -19; Basic attack 124%, attack 1 enemy 3 times
Level 17: MP -19; Basic attack 128%, attack 1 enemy 3 times
Level 18: MP -19; Basic attack 132%, attack 1 enemy 3 times
Level 19: MP -19; Basic attack 136%, attack 1 enemy 3 times
Level 20: MP -19; Basic attack 140%, attack 1 enemy 3 times
Level 21: MP -21; Basic attack 143%, attack 2 enemy 3 times
Level 22: MP -21; Basic attack 146%, attack 2 enemy 3 times
Level 23: MP -21; Basic attack 149%, attack 2 enemy 3 times
Level 24: MP -21; Basic attack 152%, attack 2 enemy 3 times
Level 25: MP -21; Basic attack 155%, attack 2 enemy 3 times
Level 26: MP -24; Basic attack 158%, attack 3 enemy 3 times
Level 27: MP -24; Basic attack 161%, attack 3 enemy 3 times
Level 28: MP -24; Basic attack 164%, attack 3 enemy 3 times
Level 29: MP -24; Basic attack 167%, attack 3 enemy 3 times
Level 30: MP -24; Basic attack 170%, attack 3 enemy 3 times

Dragon Fury  Master Level: 30 (USE FOR POLE ARM ONLY, IT ONLY SLASHES)
Attack multiple enemies by swinging the spear.
Level 1: HP -20, MP -10; Basic attack 80%
Level 2: HP -20, MP -10; Basic attack 90%
Level 3: HP -20, MP -10; Basic attack 100%
Level 4: HP -20, MP -10; Basic attack 110%
Level 5: HP -20, MP -10; Basic attack 120%
Level 6: HP -20, MP -10; Basic attack 130%
Level 7: HP -20, MP -10; Basic attack 140%
Level 8: HP -20, MP -10; Basic attack 150%
Level 9: HP -20, MP -10; Basic attack 160%
Level 10: HP -20, MP -10; Basic attack 170%
Level 11: HP -25, MP -15; Basic attack 175%
Level 12: HP -25, MP -15; Basic attack 180%
Level 13: HP -25, MP -15; Basic attack 185%
Level 14: HP -25, MP -15; Basic attack 190%
Level 15: HP -25, MP -15; Basic attack 195%
Level 16: HP -25, MP -15; Basic attack 200%
Level 17: HP -25, MP -15; Basic attack 205%
Level 18: HP -25, MP -15; Basic attack 210%
Level 19: HP -25, MP -15; Basic attack 215%
Level 20: HP -25, MP -15; Basic attack 220%
Level 21: HP -30, MP -20; Basic attack 223%
Level 22: HP -30, MP -20; Basic attack 226%
Level 23: HP -30, MP -20; Basic attack 229%
Level 24: HP -30, MP -20; Basic attack 232%
Level 25: HP -30, MP -20; Basic attack 235%
Level 26: HP -30, MP -20; Basic attack 238%
Level 27: HP -30, MP -20; Basic attack 241%
Level 28: HP -30, MP -20; Basic attack 244%
Level 29: HP -30, MP -20; Basic attack 247%
Level 30: HP -30, MP -20; Basic attack 250%

Sacrifice  Master Level: 30
Attack one enemy regardless their weapon defense by sacrificing character’s \
HP.
Level 1: MP -12; Basic attack 205%, sacrifice 20% HP from damage
Level 2: MP -12; Basic attack 210%, sacrifice 19% HP from damage
Level 3: MP -12; Basic attack 215%, sacrifice 19% HP from damage
Level 4: MP -12; Basic attack 220%, sacrifice 18% HP from damage
Level 5: MP -12; Basic attack 225%, sacrifice 18% HP from damage
Level 6: MP -12; Basic attack 230%, sacrifice 17% HP from damage
Level 7: MP -12; Basic attack 235%, sacrifice 17% HP from damage
Level 8: MP -12; Basic attack 240%, sacrifice 16% HP from damage
Level 9: MP -12; Basic attack 245%, sacrifice 16% HP from damage
Level 10: MP -12; Basic attack 250%, sacrifice 15% HP from damage
Level 11: MP -15; Basic attack 255%, sacrifice 15% HP from damage
Level 12: MP -15; Basic attack 260%, sacrifice 14% HP from damage
Level 13: MP -15; Basic attack 265%, sacrifice 14% HP from damage
Level 14: MP -15; Basic attack 270%, sacrifice 13% HP from damage
Level 15: MP -15; Basic attack 275%, sacrifice 13% HP from damage
Level 16: MP -15; Basic attack 280%, sacrifice 12% HP from damage
Level 17: MP -15; Basic attack 285%, sacrifice 12% HP from damage
Level 18: MP -15; Basic attack 290%, sacrifice 11% HP from damage
Level 19: MP -15; Basic attack 295%, sacrifice 11% HP from damage
Level 20: MP -15; Basic attack 300%, sacrifice 10% HP from damage
Level 21: MP -18; Basic attack 305%, sacrifice 10% HP from damage
Level 22: MP -18; Basic attack 310%, sacrifice 9% HP from damage
Level 23: MP -18; Basic attack 315%, sacrifice 9% HP from damage
Level 24: MP -18; Basic attack 320%, sacrifice 8% HP from damage
Level 25: MP -18; Basic attack 325%, sacrifice 8% HP from damage
Level 26: MP -18; Basic attack 330%, sacrifice 7% HP from damage
Level 27: MP -18; Basic attack 335%, sacrifice 7% HP from damage
Level 28: MP -18; Basic attack 340%, sacrifice 6% HP from damage
Level 29: MP -18; Basic attack 345%, sacrifice 6% HP from damage
Level 30: MP -18; Basic attack 350%, sacrifice 5% HP from damage

Dragon Roar  Master Level: 30
Dragons attack with their roar. You can only use this skill when you have
more than half of HP.
Level 1: HP -59%, MP -16; Basic attack 96%, range 110%, stunned for 4 sec.
Level 15: HP -45%, MP -24; Basic attack 175%, range 250%, stunned for 3 sec.
Level 30: HP -30%, MP -30; Basic attack 240%, range 400%, stunned for 2 sec.

Power Crash  Master Level: 20
Cancels out enemy’s power up skill.
Level 1:  MP -35; 24% success rate power up improvement skill of the enemy is
  nullified
Level 2:  MP -33; 28% success rate power up improvement skill of the enemy is
  nullified
Level 3:  MP -31; 32% success rate power up improvement skill of the enemy is
  nullified
Level 4:  MP -29; 36% success rate power up improvement skill of the enemy is
  nullified
Level 5:  MP -27; 40% success rate power up improvement skill of the enemy is
  nullified
Level 6:  MP -25; 44% success rate power up improvement skill of the enemy is
  nullified
Level 7:  MP -23; 48% success rate power up improvement skill of the enemy is
  nullified
Level 8:  MP -21; 52% success rate power up improvement skill of the enemy is
  nullified
Level 9:  MP -19; 56% success rate power up improvement skill of the enemy is
  nullified
Level 10: MP -17; 60% success rate power up improvement skill of the enemy is
  nullified
Level 11: MP -16; 64% success rate power up improvement skill of the enemy is
  nullified
Level 12: MP -15; 68% success rate power up improvement skill of the enemy is
  nullified
Level 13: MP -14; 72% success rate power up improvement skill of the enemy is
  nullified
Level 14: MP -13; 76% success rate power up improvement skill of the enemy is
  nullified
Level 15: MP -12; 80% success rate power up improvement skill of the enemy is
  nullified
Level 16: MP -11; 84% success rate power up improvement skill of the enemy is
  nullified
Level 17: MP -10; 88% success rate power up improvement skill of the enemy is
  nullified
Level 18: MP -9; 92% success rate power up improvement skill of the enemy is
  nullified
Level 19: MP -8; 96% success rate power up improvement skill of the enemy is
  nullified
Level 20: MP -7; 100% success rate power up improvement skill of the enemy is
  nullified

Dragon Blood  Master Level: 20
Attack with Increased Damage, but HP slowly decreased
Level 1: MP -12 HP -48 every 4 seconds; Wep Attack +1 for 8 seconds
Level 2: MP -12 HP -46 every 4 seconds; Wep Attack +2 for 16 seconds
Level 3: MP -12 HP -44 every 4 seconds; Wep Attack +3 for 24 seconds
Level 4: MP -12 HP -42 every 4 seconds; Wep Attack +4 for 32 seconds
Level 5: MP -12 HP -40 every 4 seconds; Wep Attack +4 for 40 seconds
Level 6: MP -12 HP -38 every 4 seconds; Wep Attack +5 for 48 seconds
Level 7: MP -12 HP -36 every 4 seconds; Wep Attack +5 for 56 seconds
Level 8: MP -12 HP -34 every 4 seconds; Wep Attack +6 for 64 seconds
Level 9: MP -12 HP -32 every 4 seconds; Wep Attack +6 for 72 seconds
Level 10: MP -12 HP -30 every 4 seconds; Wep Attack +7 for 80 seconds
Level 11: MP -24 HP -29 every 4 seconds; Wep Attack +7 for 88 seconds
Level 12: MP -24 HP -28 every 4 seconds; Wep Attack +8 for 96 seconds
Level 13: MP -24 HP -27 every 4 seconds; Wep Attack +8 for 104 seconds
Level 14: MP -24 HP -26 every 4 seconds; Wep Attack +9 for 112 seconds
Level 15: MP -24 HP -25 every 4 seconds; Wep Attack +9 for 120 seconds
Level 16: MP -24 HP -24 every 4 seconds; Wep Attack +10 for 128 seconds
Level 17: MP -24 HP -23 every 4 seconds; Wep Attack +10 for 136 seconds
Level 18: MP -24 HP -22 every 4 seconds; Wep Attack +11 for 144 seconds
Level 19: MP -24 HP -21 every 4 seconds; Wep Attack +11 for 152 seconds
Level 20: MP -24 HP -20 every 4 seconds; Wep Attack +12 for 160 seconds

Here’s my suggested build:

70- Buster 1
71- Buster 3
72- Buster 3
73- Buster 3
74- Buster 3
75- Buster 3
76- Buster 3
77- Buster 3
78- Buster 3
79- Buster 3
80- Buster 2; Dragon Blood 1
81- Dragon Blood 3
82- Dragon Blood 3
83- Dragon Blood 3
84- Dragon Blood 3
85- Dragon Blood 3
86- Dragon Blood 3
87- Dragon Blood 1; Dragon Fury 2
88- Dragon Fury 3
89- Dragon Fury 3
90- Dragon Fury 3
91- Dragon Fury 3
92- Dragon Fury 3
93- Dragon Fury 3
94- Dragon Fury 3
95- Dragon Fury 3
96- Dragon Fury 3
97- Dragon Fury 1; Elemental Resistance 2
98- Elemental Resistance 3
99- Elemental Resistance 3
100- Elemental Resistance 3
101- Elemental Resistance 3
102- Elemental Resistance 3
103- Elemental Resistance 3
104- Sacrifice 3
105- Dragon Roar 1; Power Crash 2
106- Power Crash 3
107- Power Crash 3
108- Power Crash 3
109- Power Crash 3
110- Power Crash 3
111- Power Crash 1; Dragon Roar 2
112- Dragon Roar 3
113- Dragon Roar 3
114- Dragon Roar 3
115- Dragon Roar 3
116- Dragon Roar 3
117- Dragon Roar 3
118- Dragon Roar 3
119- Dragon Roar 3
120- Dragon Roar 3

In total:
Buster: 30
Dragon Fury: 30
Dragon Blood: 20
Elemental Resistance: 20
Power Crash: 18
Dragon Roar: 30
Sacrifice: 3

The reasons behind this build:
-Buster is your most poweful move, so maxing it first is a must
-Dragon Blood increases power more
-Dragon Fury should come before the last 2 because it’s more useful
than the other 2
-Elemental Resistance allows you to have some magic defence which is nice
-Power crash isn’t that great since not a lot of high level enemies increase
power, but the last 2 abilities drain A LOT OF HEALTH
-Dragon roar is for show, and is more benificial than Sacrifice since you
deal 4000 to 15 enemies instead of 10 or 11000 to 1 enemy. Either way, it
pretty much kills you unless maxed, which still takes away 30% of your
health

Another Build:

Here’s a guide from Richard Dong [supermarth64@gmail.com] whom I would like
to thank for contributing it.

70- Elemental Resistance 1
71- Buster 3
72- Buster 3
73- Buster 3
74- Buster 3
75- Buster 3
76- Buster 3
77- Buster 3
78- Buster 3
79- Buster 3
80- Buster 3
81- Dragon Blood 3
82- Dragon Blood 3
83- Dragon Blood 3
84- Dragon Blood 3
85- Dragon Blood 3
86- Dragon Blood 3
87- Dragon Blood 2; Dragon Fury 1
88- Dragon Fury 3
89- Dragon Fury 3
90- Dragon Fury 3
91- Dragon Fury 3
92- Dragon Fury 3
93- Dragon Fury 3
94- Dragon Fury 3
95- Dragon Fury 3
96- Dragon Fury 3
97- Dragon Fury 2; Sacrifice 1
98- Sacrifice 2; Dragon Roar 1
99- Dragon Roar 3
100- Dragon Roar 3
101- Dragon Roar 3
102- Dragon Roar 3
103- Dragon Roar 3
104- Dragon Roar 3
105- Dragon Roar 3
106- Dragon Roar 3
107- Dragon Roar 3
108- Dragon Roar 2; Elemental Resistance 1
109- Elemental Resistance 3
110- Elemental Resistance 3
111- Elemental Resistance 3
112- Elemental Resistance 3
113- Elemental Resistance 3
114- Elemental Resistance 3
115- Power Crash 3
116- Power Crash 3
117- Power Crash 3
118- Power Crash 3
119- Power Crash 3
120- Power Crash 3

His Reasons:
-He believes that 1 hit killing is a must in order to save MP.
-Dragon Roar is more useful than power crush and Elemental Resistance right
now
-Elemental Resistance is better than power crush since not many monsters have
attk+ skills

My Thoughts:
-Accomplishes the same things the last 3 are in a different order.

My Final Thoughts with the Dragon Knight Build:
For the final time, I truly do not care how you level up your Dragon Knight.
As long as you:
1) Max out Buster fast
2) Max out Dragon Blood right after and then max Dragon Fury
3) Max out Dragon Roar, Elemental Resistance and almost max Power Crash

your Dragon Knight will be fine. You may max out Dragon Roar, Elemental
Resistance and Power Crash in whatever order you feel is best. It’s your
decision.