G-Mastery

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[Passive]
Increases the efficiency of the G-Core system. When the

Self BuffG-Core ExtensionSelf BuffG-Core Extension buff is max stacked,

Consume all ECP to activate [Over Strike] mode.
Increase damage to boss monsters for 15 seconds.
Reduce all skill cost and cooldown for 15 seconds. (Hyperactive, Bond Skills Excluded)

Requirements

Class	Level Required	Skill Requirement
Optimus	60	Expert Training Skill Quest

Skill Level	Level Required	Self BuffG-MasterySelf BuffG-Mastery (Upon Full Stacks of Self BuffG-ExtensionSelf BuffG-Extension)
Skill Level	Level Required	Skill MP Usage Decrease	Skill Cooldown Decrease	Damage Dealt to Boss Monsters Increase This effect is additive to your current stats. A	Duration
PvE
1	60	5%	10%	10%	15 Seconds
2	67	10%	15%
3	69	15%	20%
4	99	20%	25%
PvP
1	60	2.5%	5%	N/A	15 Seconds
2	67	5%	7.5%
3	69	7.5%	10%
4	99	10%	12.5%

Date		Changes
KR	NA	PvE	PvP
03/24/2016	07/27/2016	G-Mastery added.
04/27/2017	05/10/2017	▼ 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.
03/12/2020	04/08/2020	None	▼ Skill MP Usage Reduction decreased. ▼ Cooldown Decrease decreased.
04/25/2024	05/22/2024	▲ Cooldown Decrease increased.
03/27/2025	04/23/2025	▲ Added a feature that consumes all ECP and enters Self BuffOver Strike ModeSelf BuffOver Strike Mode when the G-Extension buff reaches max stacks.