Nightlord

Nimble Body

Increases Accuracy and Avoidability.

Master Level 20: Accuracy +20, Avoidability +40

Keen Eyes

Increases the range of attack using throwing weapons such as throwing stars & knives. Required Skill : At least Level 3 on Nimble Body

Master ‍Level 8: Range of attack for the throwing weapon: +200

Disorder

Temporarily decreases the Weapon Def. and attacking power of the affected monster, even stunting ongoing attacks. Can't use this skill on a monster that's already in "Disorder".

‍Master Level 10: MP -7; enemy's Weapon Att. -50, Weapon Def. -50 for 60 sec.

Dark Sight

Use MP to hide in the shadows. Can't be attacked, and can't attack either. Required Skill : At least Level 3 on Disorder

Master ‍Level 10: MP -15; disappear for 200 sec, no impact to Speed

Double Stab

Use MP to quickly stab a monster twice in one turn using a dagger.

Master ‍Level 20: MP -14; damage 150%

Lucky Seven

Use MP to throw 2 throwing stars and apply damage based on LUK, regardless of the rate of Claw Mastery.

Master ‍Level 20: MP -16; damage 150%

Claw Mastery

Increases the mastery of throwing stars and accuracy, along with the maximum number of throwing stars to recharge. It only applies when the character is throwing stars.

Master ‍Level 20: Mastery of claw-related weapons 60%, accuracy +20%, 200 extra throwing stars.

Critical Throw

Enables the character to make a critical attack with throwing stars on a certain success rate. Required Skill : At least Level 3 on Claw Mastery

Master Level 30: 50% success rate, critical damage 220%

Endure

Recovers additional amount of HP and MP.

Master Level 1: Additionally recovering HP 60, MP 20 every 10 sec.

Claw Booster

Use HP and MP to temporarily boost up the attacking speed of the claw. It only applies when the character is equipped with a claw throwing stars. Required Skill : At least Level 5 on Claw Mastery

Master ‍Level 20: HP -10, MP -10; Increase in claw's attacking speed for 600 sec.

Haste (Full Map Buff)

Temporarily improves the speed and jumping ability of every member of the party.

Master ‍Level 20: MP -30, +40 in speed and +20 in jump for 600 sec

Drain

Absorb some of the damage dished out to the enemy as HP. The most one can absorb at once is the character's MaxHP / 2, and can't absorb more than the MaxHP of the enemy. Hits 3 mobs. Required Skill : At least Level 1 on Endure

Master ‍Level 30: MP -24; absorb 5% of damage as HP, damage 160%

Alchemist

Increases the effect of the recovery-based items like potions and others, and lengthen time for the effect, if the item is based on such. However, items such as Elixir and others that base the recovery in % do not apply in this skill.

‍Master Level 20: Recovery rate 150%, duration of effect 150%

Hermit's Reslience

Increase player Health Points.

‍Master ‍Level 30: Increase HP by 1,000.

Meso Up (Full Map Buff)

For a certain amount of time, everyone in the party can make the enemies drop more mesos than usual with this skill.

Master ‍Level 20: MP -60; for 600 sec, Meso Drop Rate +20%

Shadow Partner

Temporarily summons a shadow of oneself, repeating every move. There's no real stamina in it, and it will disappear after a while.

‍Master Level 30: MP -55, 1 Summoning Rock; Summon for 600 sec, Attack 100%, Skill 50%

Enhanced Haste (Full Map Buff)

Temporarily increases the speed of all members in your party.

‍Master Level 10: : MP -22; +250 Avoidability, +60 Speed for 600 seconds 

Avenger

Uses MP to make an enormous throwing star for attack. The throwing star will go through an enemy, and attack the ones behind it, too.

‍Master Level 30: MP -30; Uses 3 throwing stars to attack upto 6 enemies, Damage 210%

Flash Jump

While in the air after a jump, use this skill + the arrow for a second jump. The higher the skill level, the farther the distance for the jump. Required Skill : At least Level 5 on Avenger

‍Master Level 20: MP -13, jumps a certain distance

Maple Warrior (Full Map Buff)

Increase all players' stats within a party by certain percentage.

‍Master Level 40: MP -80, for 1200 secs, all stats +20%

Shadow Shifter

With great reflexes, enables one to avoid the monster's attack.

Master ‍Level 30: Avoid enemy's attack with success rate 20%

Venomous Star

Passively smears your stars with poison; the monster struck has a chance of being poisoned. Usable up to 3 times against each monster. Does not work on bosses.

Master Level 40: Attack 50, for 8 secs, success rate 60%

Taunt

Provokes a monster, causing its general defense to increase. As a result, EXP earned and drop rate for items will increase for this monster.

Master ‍Level 30: MP -40, Increases enemy's def, experience & item drop rate by 20%

Advanced Avenger

Uses 2 stars to enchant The Avenger with dark power which can be thrown through 6 enemies, hitting them twice.

Follow the Ninja Storm path to get this skill.
Cave within the Cave has Boogie's Monsters that will drop Boogie's Whirlwind,

Master Level 40: MP -30; Damage 150%

Armament Full Control

Recall the Nightlord lost spirit memoris to the weapon and amplify its offensive power.
Follow the Ninja Ambush path to get this skill. 

Master Level 30: for 600 secs, +Critical rate 20%, 10% Critical Damage. 

Shadow Stars

Attacks a monster using 200 stars out of the currently equipped star. Allows an infinite number of stars to be thrown for a short period of time.

Master Level 40: MP -25, for 600 secs

Triple Throw

Attacks one monster by throwing 3 stars.

‍Master Level 40: MP -20, Damage 180%

Hero's Will

Enables one to shrug off abnormal conditions. The higher the skill level, the more types of abnormal conditions one can nullify.

‍‍Master Level 10: MP -30, Escape from abnormal condition. 30 second cooldown.