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

Improving HP Recovery  Master Level: 16
With this, you’ll recover even more HP every 10 seconds while standing still.
Level 1: Recover additional +3 HP
Level 2: Recover additional +6 HP
Level 3: Recover additional +9 HP
Level 4: Recover additional +12 HP
Level 5: Recover additional +15 HP
Level 6: Recover additional +18 HP
Level 7: Recover additional +21 HP
Level 8: Recover additional +24 HP
Level 9: Recover additional +27 HP
Level 10: Recover additional +30 HP
Level 11: Recover additional +33 HP
Level 12: Recover additional +36 HP
Level 13: Recover additional +39 HP
Level 14: Recover additional +42 HP
Level 15: Recover additional +45 HP
Level 16: Recover additional +50 HP

Improving Max HP Increase  Master Level: 10
When having a Level Up, if AP is used on Max HP, it raises the level of
increase for Max HP
Level 1:  After every level up, 4 Max HP will be added; if AP is used,
  3 additional HP will be added.
Level 2:  After every level up, 8 Max HP will be added; if AP is used, 
  6 additional HP will be added.
Level 3:  After every level up, 12 Max HP will be added; if AP is used,
  9 additional HP will be added.
Level 4:  After every level up, 16 Max HP will be added; if AP is used,
  12 additional HP will be added.
Level 5:  After every level up, 20 Max HP will be added; if AP is used,
  15 additional HP will be added.
Level 6:  After every level up, 24 Max HP will be added; if AP is used,
  18 additional HP will be added.
Level 7:  After every level up, 28 Max HP will be added; if AP is used,
  21 additional HP will be added.
Level 8:  After every level up, 32 Max HP will be added; if AP is used,
  24 additional HP will be added.
Level 9:  After every level up, 36 Max HP will be added; if AP is used,
  27 additional HP will be added.
Level 10: After every level up, 40 Max HP will be added; if AP is used,
  30 additional HP will be added.

Endure  Master Level: 8
Even when hanging on the rope or ladder, you’ll be able to recover some HP
after a certain amount of time.
Level 1: Recover HP every 31 seconds
Level 2: Recover HP every 28 seconds
Level 3: Recover HP every 25 seconds
Level 4: Recover HP every 22 seconds
Level 5: Recover HP every 19 seconds
Level 6: Recover HP every 16 seconds
Level 7: Recover HP every 13 seconds
Level 8: Recover HP every 10 seconds

Iron Body  Master Level: 20
Temporarily increases your weapon defense.
Level 1: MP -8; Weapon def. +2 for 75 seconds.
Level 2: MP -8; Weapon def. +4 for 85 seconds.
Level 3: MP -8; Weapon def. +6 for 95 seconds.
Level 4: MP -8; Weapon def. +8 for 105 seconds.
Level 5: MP -9; Weapon def. +10 for 120 seconds.
Level 6: MP -9; Weapon def. +12 for 130 seconds.
Level 7: MP -9; Weapon def. +14 for 140 seconds.
Level 8: MP -10; Weapon def. +16 for 155 seconds.
Level 9: MP -10; Weapon def. +18 for 165 seconds.
Level 10: MP -10; Weapon def. +20 for 175 seconds.
Level 11: MP -11; Weapon def. +22 for 190 seconds.
Level 12: MP -11; Weapon def. +24 for 200 seconds.
Level 13: MP -12; Weapon def. +26 for 215 seconds.
Level 14: MP -12; Weapon def. +28 for 225 seconds.
Level 15: MP -13; Weapon def. +30 for 240 seconds.
Level 16: MP -13; Weapon def. +32 for 250 seconds.
Level 17: MP -14; Weapon def. +34 for 265 seconds.
Level 18: MP -14; Weapon def. +36 for 275 seconds.
Level 19: MP -15; Weapon def. +38 for 290 seconds.
Level 20: MP -15; Weapon def. +40 for 300 seconds.

Power Strike  Master Level: 20
Use MP to deliver a killer blow to the monsters with a sword.
Level 1: MP -4; Sword damage 114%
Level 2: MP -4; Sword damage 120%
Level 3: MP -4; Sword damage 126%
Level 4: MP -4; Sword damage 132%
Level 5: MP -5; Sword damage 142%
Level 6: MP -5; Sword damage 148%
Level 7: MP -5; Sword damage 154%
Level 8: MP -6; Sword damage 164%
Level 9: MP -6; Sword damage 170%
Level 10: MP -7; Sword damage 180%
Level 11: MP -7; Sword damage 186%
Level 12: MP -8; Sword damage 196%
Level 13: MP -8; Sword damage 202%
Level 14: MP -9; Sword damage 212%
Level 15: MP -9; Sword damage 218%
Level 16: MP -10; Sword damage 228%
Level 17: MP -10; Sword damage 234%
Level 18: MP -11; Sword damage 244%
Level 19: MP -11; Sword damage 250%
Level 20: MP -12; Sword damage 260%

Slash Blast  Master Level: 20
Use HP and MP to attack every enemy around you with a sword.
Level 1: MP -6; HP -8, damage 57%
Level 2: MP -6; HP -8, damage 60%
Level 3: MP -6; HP -8, damage 63%
Level 4: MP -6; HP -8, damage 66%
Level 5: MP -7; HP -9, damage 71%
Level 6: MP -7; HP -9, damage 74%
Level 7: MP -7; HP -9, damage 77%
Level 8: MP -8; HP -10, damage 82%
Level 9: MP -8; HP -10, damage 85%
Level 10: MP -9; HP -11, damage 90%
Level 11: MP -9; HP -11, damage 93%
Level 12: MP -10; HP -12, damage 98%
Level 13: MP -10; HP -12, damage 101%
Level 14: MP -11; HP -13, damage 106%
Level 15: MP -11; HP -13, damage 109%
Level 16: MP -12; HP -14, damage 114%
Level 17: MP -12; HP -14, damage 117%
Level 18: MP -13; HP -15, damage 122%
Level 19: MP -13; HP -15, damage 125%
Level 20: MP -14; HP -16, damage 130%

Here’s my suggested build.

10- HP Recover 1
11- HP Recover 3
12- HP Recover 1; Improving Max HP Increase 2
13- Improving Max HP Increase 3
14- Improving Max HP Increase 3
15- Improving Max HP Increase 2; Power Strike 1
16- Power Strike 3
17- Power Strike 3
18- Power Strike 3
19- Slash Blast 3
20- Slash Blast 3
21- Slash Blast 3
22- Slash Blast 3;
23- Slash Blast 1; Power Strike 2
24- Power Strike 3
25- Power Strike 3
26- Power Strike 2; HP Recover 1
27- HP Recover 3
28- HP Recover 3
29- HP Recover 3
30- HP Recover 1; Endure 2

In total:
HP Recover: 16
Max HP: 10
Power Strike: 20
Slash Blast: 13
Endure: 2

My reasons behind this madness are as followed:
- Need 5 HP Recover in order to put anything into Improving Max Hp Increase
- The sooner you max Improving Max HP Increase, the more Hp you have
- Powerstrike is next so you have a poweful attack, but should only be
  leveled to 10 because its still 180% damage and you don’t want to waste too
  much mp
- Slash Blast kills multiple enemies, and enemies in this level come in
  numbers. Stop at lvl 13 because you hit 100% now
- Finish Powerstrike for max possible damage
- Max HP Recover to recover hp faster
- Had nothing better to put it in. Also, Endure allows me to heal in safety.
  Usually when im away for extended times, I need safe place to heal, so by
  the time im back, Endure fully healed me.

Other Reasons:
-Raising wep def with Iron Body is useless if you 1 hit kill enemies
-Slash Blast is good, but as a Dragon Knight, you will be using better
abilities that have the same purpose.

Another Build:

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

10- HP Recover 1
11- HP Recover 2
12- HP Recover 1; Improving Max HP Increase 2
13- Improving Max HP Increase 3
14- Improving Max HP Increase 3
15- Improving Max HP Increase 2; 1 Power Strike
16- Slash Blast 3
17- Slash Blast 3
18- Slash Blast 3
19- Slash Blast 1; Power Strike 2
20- Power Strike 3
21- Power Strike 3
22- Power Strike 3
23- Power Strike 3
24- Power Strike 3
25- Power Strike 2; Slash Blast 1
26- Slash Blast 3
27- Slash Blast 3
28- Slash Blast 3
29- Endure 3
30- 3 into whatever

His reasons:
-Maxing out Slash Blast leads to faster leveling and it’s a long way until
you are a Dragon Knight
- Maxing HP recovering isn’t that good since you will be dedicated to
training and not standing around

My thoughts:
This build is 100% perfectly fine to me. For one, Slash Blast kills multiple
enemies. From level 15-20 I suggest that you train in the slime tree in the
section
  14) Tips, Strategies and Locations when Leveling

In the slime tree, there are way too many slimes, so leveling up Slash Blast
isn’t that bad. Also, I noticed that when I was training my Warrior, potions
seemed to be better than sitting around and waiting. In otherwords, not
maxing HP Recovery is a completely valid choice to me. One thing though is
that instead of putting your 6 skill points from levels 29 and 30, he puts
things into Endure. This is ok, but your also able to put it into HP recovery
and incerease the amount you recover, since Endure envolves you hanging from
a ladder taking even more time to heal.

Final Thoughts with a Warrior Build:
I truly don’t care what you do with your Warrior as long as you

1) Max out Improving Max HP Increase first
2) Max out Power strike
3) Don’t put anything into Iron Body (because you get Hyper Body as a
   Spearman which raises HP by 60%) 

If you want to max Slash Blast and level it a little earlier, and don’t want
to max HP Recovery like Richard Dong [supermarth64@gmail.com] said, that is
fine as well. Since your really only toying around with 4 skills, there
isn’t much more to do with the Warrior.

***I do not want any more e-mails on Warrior builds since
Richard Dong [supermarth64@gmail.com]and I covered most, if not, all the
other possible ways of leveling up a good Warrior.***