Key of Proof

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FYPassive2.png [Passive] Increases damage and reduces MP usage of skills used in midair.


Class Level Required
Freyja 60

Skill Information


Skill Level Level Required Damage Increase MP Reduction
1 60 10% 5%
2 66 20% 10%
3 68 30% 15%
4 99 40% 20%


Skill Level Level Required Damage Increase MP Reduction
1 60 5% 2.5%
2 66 10% 5%
3 68 15% 7.5%
4 99 20% 10%

Tips and Details

  • For any skills that can be set up in advance, like the loading of Grenades or setting up C4 Remote Control, the damage increase is applied based on where each individual cast is used from, not where you load up or detonate them from.


Date Changes
04/27/2017 -
  • Damage Increase decreased.
  • MP Reduction decreased.
04/25/2019 05/22/2019
  • Damage Increase increased.
  • MP Reduction increased.
  • None

Alternative Names

Server Name Translation
Korean Flag.png South Korea 증명의 열쇠 Key of Proof
Chinese Flag.png China (Simplified Chinese) 滞空掌握 Flight Training
French Flag.png France Clé de preuve Key of Proof
Bresil Flag.png Brazil Chave dos Céus Key of the Skies

Freyja Skills
Hyper Active
FreySkill16.png D-Day
Special Active
FreySkill08.png Neil Sniping     FreySkill10.png C4 Remote Control     FreySkill12.png Photon Bomb     FreySkill14.png G-96 Pressure Grenade
FreySkill07.png Spiral Shot     FreySkill13.png Phantom Chaser     FreySkill15.png Blazing Bullet
FYPassive1.png Arsenal Reinforcement     FYPassive2.png Key of Proof     FYPassive3.png Quarter Master