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Room restrict limitknifeThe SKULL-9 or Skull Axe is a SKULL melee in Counter-Strike Online.


Empty slot This weapon has Part System installed.

SKULL-9 is a large battle axe made from a type of special alloy material developed by the government and has murderous destruction power, especially towards zombies. It can kill multiple targets in just one slash and has longer attack range than normal melee weapons. However, it has a very low slash rate and only sold for a limited period of time.


  • Does massive damage to zombies
  • Has longer attack range
  • Can kill multiple targets in just a slash
  • Does one hit kill against Bots, including legs
  • Does not affect player's speed
  • Has wider damage area in secondary slash
  • Available in most modes


  • Has an attack delay
  • Low rate of slash
  • Shorter range for secondary slash

Release date[]

  • South Korea: 16 December 2010
  • China: 22 December 2010
  • Taiwan/Hong Kong: 11 January 2011
  • Japan: 31 March 2011.
  • Singapore/Malaysia: 9 November 2011.
  • Indonesia: 14 March 2012.
  • Turkey: 5 March 2014.
  • CSN:Z: 23 September 2014.
  • Vietnam: 26 March 2015.


Skull-9 has 2 modes: primary slash (vertically) and secondary slash (horizontally):

  • Primary slash is faster and has a longer reach but has narrower damage area and weaker.
  • Secondary slash is more powerful and wider damage area but slower and has shorter reach.

Normal matches[]

  • SKULL-9 can kill all enemies in its range with just one swing under the condition that the enemy does not wear armor or the attacker is aiming for legs.
  • When equipped with Kevlar, SKULL-9 can only reduce the health of the enemy from 100 to 15, unless you are skillful enough to score a headshot.
  • Predict a good timing and range to do an attack.

Zombie Mods[]

Part (Zombie) Damage (+ Kevlar)
Head 2900
Chest, Gut, Leg 725
  • The minimum damage is 725. A skilled and lucky player can score damage which can amount to a devastating 8700, which is enough to kill most non-origin zombies in one hit.
  • Take a chance when a zombie is being fired upon by humans on at least 2 sides.
  • Keeping your distance between you and your enemies is very important tactic when using the SKULL-9.
  • Predict the right time to give the slash.
  • Use it in closed area such as ducts.
  • Use this weapon against newly infected/common zombies as they are weak.
  • Try to aim for the head/back to give tremendous damage.
  • Note that SKULL-9's primary slash has longer attack range than its secondary slash, use primary slash for attacking/retreating, while use secondary slash for surprise attacks and ambushes.
  • Use this weapon in ducts when the human in front you gets infected.

Zombie Scenario[]

  • SKULL-9 is excellent at destroying tough obstacles, as well as dealing with mini bosses and handling grouped zombies.
  • If you use this weapon to destroy obstacles, you'll get more money than usual ($200).
  • Use this weapon for rushing purpose if you have a backup.
  • SKULL-9 is strong enough to kill most zombies even without upgrading the attack power.

Human Scenario[]

  • This weapon is able to kill Troopers and Lancers with one slash.
  • This weapon also can kill Titans with two slashes to the head.

Tactics facing SKULL-9 users[]

Normal mode[]

  • Don't caught off your guard when facing other enemies, SKULL-9 long reach will kill you instantly if your HP is below 85.
  • Remember to buy Kevlar.
  • Try to work in groups and attack SKULL-9 users in various directions. Don't face he/she alone if you don't have proper skills to dodge SKULL-9's slash.
  • SKULL-9 is slow, use this as an advantage.

Zombie Mods[]

  • Don't recklessly face a SKULL-9 user when your health is below 1000 because he/she can kill you with just one slash (even if you survive from the attack, he/she can still kill you easily).
  • Always look back when retreating as most SKULL-9 will try to do a back slash.


Drawing sound

Hitting sound

Attack miss sound

Attack sound


Wall impact sound


  • In older versions, SKULL-9 dealt lower damage and it was as heavy as an AWP
  • Because of its attack delay, SKULL-9 has some bugs related to it:
    • When the player slashes and quickly switches to another weapon, the kill icon will eventually become the weapon that the player switched to. Moreover, your weapon will perform a cut-off animation either if it misses the hit or lands one. 
    • Its attack delay can be combined with different weapons, and doing so will give different attack boost or knockback boost that can be used against the victim. For example: M79, Double and Triple Barrel can knock zombies far away, as if Hammer is used. Ripper, Thunderbolt, Drill, Gae Bolg, Compound Bow and AS50 can do tremendous damage, it can kill more than 1 zombie if Deadly Shot is also activated in the bug-hit. However, be noted that using Deadly Shot while performing this SKULL-9 bug is a bannable offence in certain versions.
    • The attack delay allows this weapon to be a great tool to upgrade guns without using any ammo at all in Scenario modes.
  • SKULL-9 is the first melee weapon which deals the same damage in both primary and secondary attack, followed by the Green Dragon Blade.
  • There is a bug where the primary attack animation freezes for some seconds if the user has high ping (especially if it is swung repeatedly). It also happens on the secondary attack of the Green Dragon Blade. This is because those animations are split into two sequences actually. Now the bug from them finally fixed.
  • Both SKULL-9 and SKULL-11 are the only weapons in the SKULL series that cannot penetrate through objects but bodies.
  • This melee weapon shares the same wall impact sound with BALROG-IX and Green Dragon Blade.
  • In CSN:S, SKULL-9 along with Hammer and Nata Knife, is caregorized as an item rather than as a weapon, causing it to break in CSN:S May 20 2021 update. The bug got fixed in September 15, 2021 Update.
    • DIsassembling it will only reward 100 Mileage instead of 500. (already present before the May 20 update)
    • Parts can't be attached to the weapon. (Will faill in the process, but parts won't be consumed)
    • Enhancing it causes to show as a random weapon in the enhancement success window, however, no issues shown when using SKULL-9 as enhacement material
    • Selling it on Mileage Auction (and probably using it in Bonus DIsassembly as well) would cause a random permament weapon, even default weapons would dissapear from inventory
    • Attempting to paint it will fail, causing the paint to be consumed and be applied to a random weapon, even if is not supposed to have the paint.

External links[]