Ex-S Viper

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MHSActive3.png [Special Active: Tenacity] Summon the thermal firearm [Ex-S Viper] to subdue the area for the duration.
The summoned Ex-S Viper will fire forward wildly for 7.5 seconds.
Over Strike
  • Upon activating Over Strike, skill attack power increases.
Final Enhanced Skill
  • Speed is increased by 1.2 times.


Class Level Required
Metal Heart 30

Skill Information


Level Required Damage (Magical) Max Hits Duration MP Usage Cooldown
Viper Shot Viper Explosion Viper Shot Viper Explosion
30 168% 78% 15 1 7.5 Seconds 100 MP 9 Seconds


Level Required Damage (Magical)
Viper Shot Viper Explosion
30 64% 30%

Skill Traits

Reversed Ex-S Viper Haste Ex-S Viper
Attribute Effect MP Cost Cooldown Attribute Effect Cooldown
MP Usage decreased to 70%
Cooldown increased to 130%
70 MP 11.7 seconds Cooldown decreased to 80% 7.2 seconds

Total Damage

Mode Regular Mechanic Mastery/Sub Mech Revolution
Normal Over Strike Normal Ex-SS Viper
Normal Over Strike Normal Over Strike
PvE 2,598% 3,117.6% 3,897% 4,676.4% 5,376% 6,451.2%
PvP 990% 1,188% 1,485% 1,782% 2,049% 2,458.8%

Related Skills

MHPassive.png Mechanic Mastery OptPassive2.png Mecha Generator OptTrans5.png Sub Mech Revolution
Lock.gifForbidden Tome of Secrets II.png Forbidden Secret Manual (II) is needed to unlock this skill, available through the Power of Transcendence Skill Quest or Item Mall.
Prime Operator - Passive 1.png Mecha Control

Tips and Details

  • This skill is affected by Sub Mech Revolution, making the skill ignore guard and causing a second Viper weapon called Ex-SS Viper to spawn at a certain chance.
  • The Viper weapon fires twice every second and inflicts hitstun for its entire duration, making it nearly impossible for an opponent to escape it after being hit once.
  • The Ex-S and additional Ex-SS Viper weapon count as separate summoned units for the Mecha Generator passive.


Date Changes
03/24/2016 07/27/2016
  • Ex-S Viper added.
06/30/2016 -
  • None
  • Hitstun removed.
01/12/2017 -
  • Damage decreased.
04/27/2017 -
  • Damage increased.
  • Viper Explosion damage decreased.
04/05/2018 04/18/2018
  • Viper Shot damage increased.
  • Viper Explosion damage decreased.

Alternative Names

Server Name Translation
Korean Flag.png South Korea Ex-S 바이퍼 Ex-S Viper
Chinese Flag.png China (Simplified Chinese) Ex-S蝰蛇 Ex-S Viper
French Flag.png France Vipère Ex-S Ex-S Viper

Metal Heart Skills
Special Active
MHSActive1.png Air Mecha : Gale Force     MHSActive2.png Ez-8 Countdown     MHSActive3.png Ex-S Viper     MHSActive4.png Sparrow Factory     MHSActive5.png Mecha Drop
MHActive1.png KS-83     MHActive2.png Robot Detonation
MHBuff.png Limit Over
MHPassive.png Mechanic Mastery