Theif Skills + Skill Build

Assassin / Bandit-Sin (Recommended!)
Bandit-Sin means they use assassin build to gain attacking range to level up more quickly, and when they reach 2nd job, they choose Bandit job in Thief. 1st job assassins use claw to throw throwing-star that can be purchased and recharge in potion shop.
10 – 10 : Lucky Seven 1
11 – 11 : Nimble Body 3
12 – 13 : Keen Eyes 3
14 – 14 : Keey Eyes 2 [MAX], Lucky Seven 1
15 – 16 : Lucky Seven 3
17 – 17 : Lucky Seven 2, Save SP 1
18 – 19 : Save SP 3
20 – 20 : Lucky Seven 10 [MAX]
21 – 25 : Nimble Body 3
26 – 26 : Nimble Body 2 [MAX], Disorder 1
27 – 27 : Disorder 2, Dark Sight 1
28 – 30 : Dark Sight 3
Summary – Total 61 SP
Lucky Seven 20 [MAX] / Nimble Body 20 [MAX] / Keen Eyes 8 [MAX]
Disorder [3/20] / Dark Sight [4/20] / Double Stab [0/20]
Reason for this Build
The core skills for a future assassin is basically Lucky 7, Nimble Body and Keen Eyes. Add 1 SP (Skill Point) into Lucky 7 so you can spend your MP. Lucky 7 uses Claw to throw star. Keen Eyes is maxed first because you will need the extra range to hit monsters from far. Once it is maxed, you can hit monsters to the corner of your screen! With this skill max, you don’t waste throwing-stars that won’t hit monsters that are far away from you. Then max out Lucky 7 as your core attacking skill so you can train on powerful mobs with better EXP (Experience). Next add SP into Nimble Body to provide you with additional avoidability and accuracy. The avoidability makes Thief special, as they can avoid monster when bumping against them, in the long run, you save tons of HP Potions!

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Bandit (Recommended!)
This is the common build for bandit that use dagger to train in 1st job. Dark Sight is useful for 4th job skill (Assassination). How assassination works? The longer you are in dark sight, the charge more damage.
10 – 10 : Double Stab 1
11 – 16 : Double Stab 3 [MAX]
17 – 17 : Double Stab 1, Nimble Body 2
18 – 23 : Nimble Body 3 [MAX]
24 – 24 : Disorder 3
25 – 30 : Dark Sight 3
Summary – Total 61 SP
Lucky Seven [0/20] / Nimble Body 20 [MAX] / Keen Eyes [0/8]
Disorder [3/20] / Dark Sight [18/20] / Double Stab 20 [MAX]
Reason for this Build
Thief who wants to use dagger to attack should add Double Stab as their core attacking skill. Once that is max, add Nimble Body to boost your accuracy and avoidability. Add 3 SP (Skill Points) into Disorder to activate Dark Sight. Disorder is not useful at higher levels, so it is recommended not to add more than 3 SP into Disorder. The remaining SP is added into Dark Sight since Bandit at 4th Job requires a Dark Sight to increase its damage! The 4th Job Skill is called Assassinate whereby the longer you are in Dark Sight, the chances of Critical and Damage increases! For more information, visit the 4th Job Thief Shadower Page in this blog.

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Nimble Body (more info)
Increases accuracy and avoidability. This makes Thief Class experts in dodging enemy attacks. The higher avoidability a Thief have, the better chance to avoid physical and magical attack. Thus, you save on your Hp Potion from being used to recover lost Hp. It gives additional accuracy that is useful while training on high avoidability monsters. Accuracy does not effect the player’s damage but makes it more effective hit a monster without miss. Recommended to be max!
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Master Level: 20 | Type: Passive
Level 1: Accuracy +1, avoidability +1
Level 2: Accuracy +2, avoidability +2
Level 3: Accuracy +3, avoidability +3
Level 4: Accuracy +4, avoidability +4
Level 5: Accuracy +5, avoidability +5
Level 6: Accuracy +6, avoidability +6
Level 7: Accuracy +7, avoidability +7
Level 8: Accuracy +8, avoidability +8
Level 9: Accuracy +9, avoidability +9
Level 10: Accuracy +10, avoidability +10
Level 11: Accuracy +11, avoidability +11
Level 12: Accuracy +12, avoidability +12
Level 13: Accuracy +13, avoidability +13
Level 14: Accuracy +14, avoidability +14
Level 15: Accuracy +15, avoidability +15
Level 16: Accuracy +16, avoidability +16
Level 17: Accuracy +17, avoidability +17
Level 18: Accuracy +18, avoidability +18
Level 19: Accuracy +19, avoidability +19
Level 20: Accuracy +20, avoidability +20

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Keen Eyes (more info)
Increases the range of attack using throwing weapons such as throwing stars & knives. This is very useful for Party Quest (Ludibrum Party Quest) that requires max range attack. Recommended to be max for assassin!
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Master Level: 8 | Type: Passive | Pre-requisite: Nimble Body Lv. 3
Level 1: Range of attack for throwing weapon: +25
Level 2: Range of attack for throwing weapon: +50
Level 3: Range of attack for throwing weapon: +75
Level 4: Range of attack for throwing weapon: +100
Level 5: Range of attack for throwing weapon: +125
Level 6: Range of attack for throwing weapon: +150
Level 7: Range of attack for throwing weapon: +175
Level 8: Range of attack for throwing weapon: +200

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Disorder (more info)
Temporarily decreases the morale of an opponent. Its weapon def. and attack will suffer, and the attacking enemy will suddenly stop attacking. Can’t perform the attack on an enemy that’s already in “disorder”, however. Not useful against high level monster that has a few hundred of weapon defense and magic defense. Not recommended to be max but pump at least 3 SP (skill points) of Disorder to activate Dark Sight.
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Master Level: 20 | Type: Supportive
Level 1: MP -5; Enemy’s weapon attack -1, weapon def. -1 for 7 seconds
Level 2: MP -5; Enemy’s weapon attack -2, weapon def. -2 for 9 seconds
Level 3: MP -5; Enemy’s weapon attack -3, weapon def. -3 for 11 seconds
Level 4: MP -5; Enemy’s weapon attack -4, weapon def. -4 for 13 seconds
Level 5: MP -5; Enemy’s weapon attack -5, weapon def. -5 for 15 seconds
Level 6: MP -6; Enemy’s weapon attack -6, weapon def. -6 for 20 seconds
Level 7: MP -6; Enemy’s weapon attack -7, weapon def. -7 for 22 seconds
Level 8: MP -6; Enemy’s weapon attack -8, weapon def. -8 for 24 seconds
Level 9: MP -7; Enemy’s weapon attack -9, weapon def. -9 for 29 seconds
Level 10: MP -7; Enemy’s weapon attack -10, weapon def. -10 for 31 seconds
Level 11: MP -7; Enemy’s weapon attack -11, weapon def. -11 for 33 seconds
Level 12: MP -8; Enemy’s weapon attack -12, weapon def. -12 for 38 seconds
Level 13: MP -8; Enemy’s weapon attack -13, weapon def. -13 for 40 seconds
Level 14: MP -8; Enemy’s weapon attack -14, weapon def. -14 for 42 seconds
Level 15: MP -9; Enemy’s weapon attack -15, weapon def. -15 for 47 seconds
Level 16: MP -9; Enemy’s weapon attack -16, weapon def. -16 for 49 seconds
Level 17: MP -9; Enemy’s weapon attack -17, weapon def. -17 for 51 seconds
Level 18: MP -10; Enemy’s weapon attack -18, weapon def. -18 for 56 seconds
Level 19: MP -10; Enemy’s weapon attack -19, weapon def. -19 for 58 seconds
Level 20: MP -10; Enemy’s weapon attack -20, weapon def. -20 for 60 seconds

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Dark Sight (more info)
Use MP to hide behind the shadows. While hiding, the enemy won’t attack, but you can’t attack back either. All movements other than attacking are available. It’s temporary, so after a while, you’ll be back to normal. To deactivate this skill, simply press the attack button (the normal weapon attack without skill) OR use your mouse cursor and right-click on the Dark Sight icon located at the top right of your MapleStory in-game screen.
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Useful for Shadower Assassinate (4th job skill). The longer you are in dark sight, the more damage is being charge for assassinate skill. Dark Sight is also used in Ludibrum Party Quest to avoid touching Dark Block Golem that deals 8000 damage. Dark Sight will cancel out Haste (2nd Job Skill) unless Dark Sight is at max level. However, if you are in Dark Sight, and another thief haste you, it would not cancel that effect. While in Dark Sight, you could only avoid Physical bump but not physical attack (earthquake/pound) and magical attack. Apart from that, it is commonly used with Meso Explosion (aka Meso Bomb) at Zakum (Boss). Chief Bandit (3rd Job Players) will activate Dark Sight, and stand nearby the monster and drop bag of meso, and later explode them.
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Master Level: 20 | Type: Supportive | Pre-requisite: Disorder Lv. 3
Level 1: MP -24; Disappear for 10 seconds, speed -30
Level 2: MP -23; Disappear for 20 seconds, speed -28
Level 3: MP -22; Disappear for 30 seconds, speed -26
Level 4: MP -21; Disappear for 40 seconds, speed -24
Level 5: MP -20; Disappear for 50 seconds, speed -22
Level 6: MP -19; Disappear for 60 seconds, speed -20
Level 7: MP -18; Disappear for 70 seconds, speed -18
Level 8: MP -17; Disappear for 80 seconds, speed -16
Level 9: MP -16; Disappear for 90 seconds, speed -14
Level 10: MP -15; Disappear for 100 seconds, speed -12
Level 11: MP -14; Disappear for 110 seconds, speed -10
Level 12: MP -13; Disappear for 120 seconds, speed -8
Level 13: MP -12; Disappear for 130 seconds, speed -7
Level 14: MP -11; Disappear for 140 seconds, speed -6
Level 15: MP -10; Disappear for 150 seconds, speed -5
Level 16: MP -9; Disappear for 160 seconds, speed -4
Level 17: MP -8; Disappear for 170 seconds, speed -3
Level 18: MP -7; Disappear for 180 seconds, speed -2
Level 19: MP -6; Disappear for 190 seconds, speed -1
Level 20: MP -5; Disappear for 200 seconds, regular moving speed

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Double Stab (more info)
Use MP to quickly stab an enemy twice at once using a dagger. Only Bandit max this! Bandit-Sin (hybrid build of assassin in 1st job, and being bandit in 2nd job) does not max this! Uses dagger instead of throwing stars and claw. Its much cheaper than Lucky Seven equipments.
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Master Level: 20 | Type: Active
Level 1: MP -8; damage 98% x 2 Hits
Level 2: MP -8; damage 100% x 2 Hits
Level 3: MP -8; damage 102% x 2 Hits
Level 4: MP -8; damage 104% x 2 Hits
Level 5: MP -9; damage 106% x 2 Hits
Level 6: MP -9; damage 108% x 2 Hits
Level 7: MP -9; damage 110% x 2 Hits
Level 8: MP -10; damage 110% x 2 Hits
Level 9: MP -10; damage 112% x 2 Hits
Level 10: MP -10; damage 114% x 2 Hits
Level 11: MP -11; damage 116% x 2 Hits
Level 12: MP -11; damage 118% x 2 Hits
Level 13: MP -11; damage 120% x 2 Hits
Level 14: MP -12; damage 122% x 2 Hits
Level 15: MP -12; damage 124% x 2 Hits
Level 16: MP -12; damage 126% x 2 Hits
Level 17: MP -13; damage 128% x 2 Hits
Level 18: MP -13; damage 130% x 2 Hits
Level 19: MP -13; damage 134% x 2 Hits
Level 20: MP -14; damage 140% x 2 Hits

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Lucky Seven / Lucky 7 / Lucky7 (more info)
Use MP to throw 2 throwing stars and apply damage based on LUK, regardless of the rate of javelin mastery. This is the only skill in MapleStory that does not require weapon mastery. Lucky Seven depends on weapon attack and LUK. The more WA and LUK (luck) you have, you deal more damage! (Formula for Lucky 7 Damage)
Requires a claw and throwing-star. The claw (similar to a glove) allows Thief to hold/handle sharp throwing-stars. Both does not come cheap. Unlike bowman arrows, throwing-star is not drop frequently by monster, its like rare item. Throwing-star can’t be scrolled and it has its own weapon attack. There are different types of throwing-star dropped by different monster. The difference between these throwing-stars are in weapon attack and recharge cost. Some has more capacity and some cost higher when its being recharged only in potion shop. (not weapon store)
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Master Level: 20 | Type: Active
Level 1: MP -8; Damage 58% x 2 Hits
Level 2: MP -8; Damage 62% x 2 Hits
Level 3: MP -8; Damage 66% x 2 Hits
Level 4: MP -8; Damage 70% x 2 Hits
Level 5: MP -9; Damage 76% x 2 Hits
Level 6: MP -9; Damage 80% x 2 Hits
Level 7: MP -9; Damage 84% x 2 Hits
Level 8: MP -10; Damage 90% x 2 Hits
Level 9: MP -10; Damage 94% x 2 Hits
Level 10: MP -11; Damage 100% x 2 Hits
Level 11: MP -11; Damage 104% x 2 Hits
Level 12: MP -12; Damage 110% x 2 Hits
Level 13: MP -12; Damage 114% x 2 Hits
Level 14: MP -13; Damage 120% x 2 Hits
Level 15: MP -13; Damage 124% x 2 Hits
Level 16: MP -14; Damage 130% x 2 Hits
Level 17: MP -14; Damage 134% x 2 Hits
Level 18: MP -15; Damage 140% x 2 Hits
Level 19: MP -15; Damage 144% x 2 Hits
Level 20: MP -16; Damage 150% x 2 Hits

This was really helpful for me thanks

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Looks like a long wall of text

I hadn't time to read all this (as I know this already) but I did most, and I gotta say it looks like you used some time and effort into this. It's a nice guide