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 Skills Used in Midair
Damage Increase MP Reduction
1 60 10% 5%
2 66 10%
3 68 30% 15%
4 99 20%
1 60 5% 2.5%
2 66 5%
3 68 10% 7.5%
4 99 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
02/18/2016 07/13/2016
  • Key of Proof added.
04/27/2017 -
  • Damage Increase decreased.
  • MP Reduction decreased.
04/25/2019 05/22/2019
  • Damage Increase increased.
  • MP Reduction increased.
  • None
08/01/2019 08/28/2019
  • Damage Increase decreased.
  • Damage Increase 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
German Flag.png Germany Beweisschlüssel Key of Proof
Spanish Flag.png Spain Llave testimonio Key of Proof
French Flag.png France Clé de preuve Key of Proof
Italian Flag.png Italy Chiave di prova Key of Proof
Polish Flag.png Poland Klucz Dowodowy Key of Proof
English Flag.png United Kingdom Proof Key
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     PenetratingBullet.png Penetrating Bullet     FYTrans1.png M18A1 Claymore     FYTrans3.png Viper Shower     FYTrans6.png Einherjar
FreySkill15.png Blazing Bullet     FreySkill13.png Phantom Chaser     FYTrans2.png Phantom Shot
FYPassive1.png Arsenal Reinforcement     FYPassive2.png Key of Proof     FYPassive3.png Quarter Master     FYTrans4.png Awakened Will: Freyja     TransShared.png Awakened One     FYTrans5.png Enhance Equipment