Heavy Weapon Mastery

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StormTrooper9.png [Passive] Each time a Special Active skill is used, you gain a buff that increases Active/Special Active skill attack power for a certain time.
When the buff wears off, stacks are decreased one by one. (Max of 5 stacks)


Class Level Required
Storm Trooper 60

Skill Information

Skill Level Level Required Heavy Weapon Mastery
(After Using a Special Active Skill)
All Skill Damage Increase Max Stacks Duration per Stack Stack Lost After Duration
1 60 3% 5 ?? Seconds 1
2 66 4% ?? Seconds
3 68 5% ?? Seconds
4 99 6% 15 Seconds

Tips and Details

  • The stacks are displayed next to you as an ammo bar. Each stack will fill up one of the 5 slots.
  • As the effect declines 1 stack at a time, the effective duration of 5 stacks is 75 seconds until you no longer have the buff at all.
  • The buff duration starts going down as soon as your last Special Active's animation ends. For skills that can be extended, such as M-3 Flamethrower, it will start going down as soon as you release the skill button.



Date Changes
01/21/2016 -
  • Fixed issue where active and special active attack increases effects getting stacked.
02/04/2016 -
  • Duration increased.
04/27/2017 -
  • Active/Special Active Damage Increase decreased.
  • Duration decreased.
08/23/2018 09/06/2018
  • Active/Special Active Damage Increase increased.
09/20/2018 10/11/2018
  • Duration increased.

Alternative Names

Server Name Translation
Korean Flag.png South Korea 중화기 마스터리 Heavy Arms Mastery
Chinese Flag.png China (Simplified Chinese) 重火器精通 Heavy Arms Mastery
French Flag.png France Championnat d'armes lourdes Heavy Weapon Championship
Bresil Flag.png Brazil Maestria em Armas Pesadas Heavy Arms Mastery

Storm Trooper Skills
Hyper Active
StormTrooper11.png Ancient Trigger
Special Active
StormTrooper2.png Operation Raze     StormTrooper4.png FM-92 MK2 Lancer SW     StormTrooper5.png Pampero Booster     StormTrooper6.png X-1 Extruder     StormTrooper8(New).png Plasma Shock
StormTrooper1.png PT-15 Prototype     StormTrooper7.png Booster Cannon
StormTrooper3.png Shear Plate     StormTrooper9.png Heavy Weapon Mastery     StormTrooper10.png Eagle's Radar