Skills are special abilities and perks introduced in update 2.95.
Note: As of Patch 5.6, MP usage is increased every 100 levels gained, by 1x. For example, if the player is at level 201, they will use 3x the amount of MP listed for the skill (6 MP = 18 MP).
Global Skills
Increased Jump Height  

Max Level:  10  
Base Stat:  7.63 ft  
Max Stat:  8.75 ft  
Increases your overall jump height by approximately 0.12 ft per level. 
Increased Critical Damage  

Max Level:  20  
Base Stat:  243%  
Max Stat:  450%  
Increases the amount of damage done by critical hits by approximately 12%. 
Loot Stealer  

Max Level:  45  
Base Stat:  3.93 seconds  
Max Stat:  0.85 (wrong #) seconds  
Decreases the amount of time by approximately 0.07 seconds that you must wait before stealing someone's loot. 
Rigorous Training  

Max Level:  Infinite  
Base Stat:  NA  
Max Stat:  NA  
Increases your strength, range, magic, and dexterity by 1 and increases your HP and MP by 10. 
Self Rage  

Max Level:  35  
Base Stat:  4 seconds  
Max Stat:  38 seconds  
Must be upgraded to use. Boosts your power, range, magic, and artillery by 35%. One skill point increases the duration by 1 second. Press R to rage. Costs 35 MP. 
Guild Rage  

Max Level:  35  
Base Stat:  4 seconds  
Max Stat:  38 seconds  
Must be upgraded to use. Boosts the power, range, magic, and artillery of all present guildmates (including you) by 25%. One skill point increases the duration by 1 second. Press T to rage. Costs 45 MP. 
MP Restoration  

Max Level:  40  
Base Stat:  1 MP/10 seconds  
Max Stat:  40 MP/10 seconds  
Restores MP every 10 seconds. 2 points increases MP restored by 1. The very first level increases MP restored by 2. 
Avoidance  

Max Level:  25  
Base Stat:  1% dodge change  
Max Stat:  25% dodge chance  
Chance of completely avoiding an attack. 2 skill points increases the chance by 1%. 
Speed Dash  

Max Level:  15  
Base Stat:  1.6x walking speed  
Max Stat:  3.0x walking speed  
Speed dash is activated by double tapping the directional keys. Each point increases your speed by 0.1. Uses 3 MP per second. 
Downward Acceleration  

Max Level:  40  
Base Stat:  Down acceleration: 150% & 210%  
Max Stat:  Down acceleration: 540% & 600%  
Accelerates your drop speed by pressing down in the air. If you press down while your player is falling rather than rising, the downward acceleration is even greater. Each point increases the effectiveness by 10%. Uses 3 MP per second. 
Block  

Max Level:  30  
Base Stat:  Damage reduction: 51%  
Max Stat:  Damage reduction: 80%  
Enables your character to withstand damage. When blocking, the damage is reduced by the amount shown. Each level increases the percent by 1. A shield adds an additional 10%. Press V to use. Uses 8 MP per second. 
Archer Skills
Charged Arrow Barrage  

Max Level:  4  
Base Stat:  1 arrow  
Max Stat:  5 arrows  
Increases the amount of arrows you shoot when fully charged by 1. Uses 7 MP. 
Arrow Knockback Bonus  

Max Level:  20  
Base Stat:  0.3 feet  
Max Stat:  0.6 feet  
Increases the distance that enemies are knock backed from ranged attacks by approximately 0.03 feet per skill point. 
Expert Archer  

Max Level:  Infinite  
Base Stat:  NA  
Max Stat:  NA  
Increases your range stat by 1. 
Triple Shot Attack  

Max Level:  10  
Base Stat:  7 feet  
Max Stat:  16 feet  
Shoot 3 arrows one after the other. Two points increases the distance the arrows travel by 1 foot. Costs 8 MP. Press space + down to use. 
Arrow Rain Attack  

Max Level:  6  
Base Stat:  1 arrow  
Max Stat:  6 arrows  
An attack that rains arrows down on enemies. Four points increases the number of arrows shot by 1. Costs 9 MP. Press space + up to use. 
Piercing Arrow Attack  

Max Level:  6  
Base Stat:  1 enemy  
Max Stat:  6 enemies  
Shoots an arrow that travels through multiple enemies. 2 skill points increases the number of enemies the arrow can pass through by 1. Costs 6 MP. Press space + forward to use. 
Down Crush  

Max Level:  10  
Base Stat:  103% damage  
Max Stat:  130% damage  
A downward air attack that sends you plummeting towards the ground at a fast speed. Each level increases the damage by 3%. Press space + down in the air to use. Uses 12 MP. 
Warrior Skills
Power Attack  

Max Level:  200  
Base Stat:  132% damage  
Max Stat:  530% damage  
A single attack that damages an enemy more than a normal attack. One point increases damage by 2%. Uses 6 MP. Press forward + space to use. 
Expert Warrior  

Max Level:  Infinite  
Base Stat:  NA  
Max Stat:  NA  
Increases your power stat by 1. 
Air Power Slash  

Max Level:  20  
Base Stat:  103% damage  
Max Stat:  160% damage  
Creates a powerful swing thrusting your weapon and body downward onto enemies. Each point increases the damage by 3%. Press space + down in the air to use it. Uses 24 MP 
Shield Mastery  

Max Level:  35  
Base Stat:  Shield Bonus 102%  
Max Stat:  Shield Bonus 170%  
Increases the effectiveness of shields by multiplying the defense of a shield by the 'shield bonus'. One point increases the bonus by 2%. 
MultiAttack  

Max Level:  5  
Base Stat:  2 enemies  
Max Stat:  6 enemies  
A special attack that also hits nearby enemies. 3 skill points increases the chain effect by 1. Costs 8 MP. Press down + space to use. 
Melee Knockback  

Max Level:  16  
Base Stat:  0.8 feet  
Max Stat:  1.3 feet  
Increases the distance enemies are knocked back by melee attacks by 0.03 feet per skill point. 
Spinning Cutter  

Max Level:  25  
Base Stat:  16% damage  
Max Stat:  40% damage  
Performs a damaging spin attack when jumping into the air. Press space + up to use. Uses 5 MP 
Wizard Skills
Magic Shots  

Max Level:  3  
Base Stat:  2 projectiles  
Max Stat:  4 projectiles  
Increases the number of magic projectiles released when attacking by 1. 
Expert Wizard  

Max Level:  Infinite  
Base Stat:  NA  
Max Stat:  NA  
Increases your magic stat by 1. 
Light Beam  

Max Level:  6  
Base Stat:  x feet  
Max Stat:  x+25 feet  
A damaging light beam. Deals 200% damage. Uses 40 MP. Press B to use. 
Magic Distance Increase  

Max Level:  20  
Base Stat:  8 feet  
Max Stat:  27 feet  
Increases the flying distance of your magic projectiles by 1 foot per skill point used. 
Thunder Attack  

Max Level:  6  
Base Stat:  1 cloud  
Max Stat:  6 clouds  
Must be upgraded to use. A special attack that summons lightning that attacks nearby enemies. Each cloud deals 180% damage of primary magic weapon. 1 cloud per enemy. Uses 30 MP. M to initiate. 
Self Heal  

Max Level:  50  
Base Stat:  35 health healed  
Max Stat:  280 health healed  
An ability that allows you to heal your health. One point increases the amount healed by 5. Uses 15 MP. Press the H key to use. 
Guild/Pet Heal  

Max Level:  50  
Base Stat:  25 health healed  
Max Stat:  270 health healed  
Heals present guild members (including yourself). One point increases the amount healed by 5. Uses 19 MP. Press the G key to use. 
Cowboy Skills
Grenade Attack  

Max Level:  7  
Base Stat:  1 Grenade  
Max Stat:  6 Grenades  
Throws grenades that deal 3x damage to enemies (1x to players in PvP). 1 level = 1 more grenade. Uses 30 MP. Press the B key to use. 
Upward Shoot  

Max Level:  2  
Base Stat:  NA  
Max Stat:  NA  
Allows you to point and shoot your gun straight up in the air. Useful for attacking enemies above you. Uses 2 MP. Press space + up to use 
Expert Cowboy  

Max Level:  Infinite  
Base Stat:  NA  
Max Stat:  NA  
Increases Artillery by 1. 
Bullet Distance Increase  

Max Level:  30  
Base Stat:  70 feet  
Max Stat:  99 feet  
Increases the distance that your bullets will travel. 1 point increases the distance by 1 foot. 
Shotgun Attack  

Max Level:  5  
Base Stat:  1 bullet  
Max Stat:  5 bullets  
Shoots your gun and sprays a fury of bullets into the air. Uses 12 MP. Press the N key to use. 
Bullet Knockback  

Max Level:  6  
Base Stat:  0.32 feet  
Max Stat:  0.47 feet  
Increases the distance that enemies are knocked back from gun attacks by 0.03 feet per 2 points. 
Jump Grenade  

Max Level:  20  
Base Stat:  110% damage  
Max Stat:  300% damage  
Drops one grenade below you while in the air. Each point increases the damage by 10%. Use by pressing space + down in the air. Uses 20 MP. 
