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OptPassive3.png [Passive] Increase the efficiency of the G-Core system. When the 'G-Core Extension' buff is max stacked, all skill's MP cost and cooldown time is decreased for 15 seconds. (Hyper Active Excluded)


Class Level Required Skill Requirement
Optimus 60 Expert Training Skill Quest

Skill Information

Skill Level Level Required G-Mastery
(At Full Stacks of G-Extension)
Skill MP Usage Reduction Cooldown Decrease Increased Damage to Bosses Duration
1 60 5% 5% 10% 15 Seconds
2 67 10% 10%
3 69 15% 15%
4 99 20% 20%


Date Changes
03/24/2016 07/27/2016
  • G-Mastery added.
04/27/2017 -
  • Skill Cost Reduction decreased.
  • Cooldown Decrease decreased.
09/20/2018 10/11/2018
  • Can be renewed at max G-Extension stacks.
  • Skill Cost Reduction changed to only Skill MP Cost Reduction.
08/01/2019 08/28/2019
  • Increased Damage to Bosses effect added.

Alternative Names

Server Name Translation
Korean Flag.png South Korea G-마스터리 G-Mastery
Chinese Flag.png China (Simplified Chinese) G-改造 G-Reform
German Flag.png Germany G-Meister G-Master
Spanish Flag.png Spain Maestro G G-Master
French Flag.png France Maître G G-Master
Italian Flag.png Italy Maestro G G-Master
Polish Flag.png Poland Mistrz G G-Master
English Flag.png United Kingdom G-Master

Optimus Skills
Hyper Active
OptHA.png Mecha Volt MX
Special Active
OptSActive1.png G-0 Battleroid     OptSActive2.png G-1 Corona     OptSActive3.png G-4 Frisbee     OptSActive4.png G-2 Rolling Thunder     MagneticGenerator.png Magnetic Generator
OptActive1.png Magnetic Guard     OptActive2.png G-3 Raptor
OptPassive1.png G-Extension     OptPassive2.png Mecha Generator     OptPassive3.png G-Mastery