• Kirito's Dual Blades
  • Heathcliff's Holy Sword

Unique Skills (ユニークスキル, Yunīku Sukiru?) are «Extra Skills» in «Sword Art Online» that are assigned to only a single player per skill. Like other Extra Skills, the prerequisites for receiving «Unique Skills» are unknown, but they are said to be given to players who fulfill a certain physical requirement. By the end of Sword Art Online, only two players were known to have Unique Skills: Heathcliff had «Holy Sword» and Kirito had «Dual Blades».

Although Sword Skills were later implemented into ALfheim Online, certain suspicious conditional skills, including «Unique Skills», were removed from the system. It is rumored that about ten skills were removed during verification, which is coincidentally the amount of «Unique Skills» said to have been created.

List of Unique SkillsEdit

English Name Japanese Name Acquisition References
Battoujutsu 抜刀術
Unlocked by completing the «Katana» skill.[1][citation needed] [2]
Darkness Blade 暗黒剣
(Ankoku Ken)
Unlocked by killing the most other players.[1][citation needed] [2]
Dual Blades 二刀流
Given to the player with the fastest reaction speed. [3]
Holy Sword 神聖剣
Given to the strongest player. [citation needed]
Infinite Spear 無限槍
(Mugen Yari)
Unlocked by completing the «Two-Handed Assault Spear» skill.[1][citation needed] [2]
Shurikenjutsu 手裏剣術
Unlocked by completing the «Blade Throwing» skill.[1][citation needed] [2]


  • The aforementioned «Unique Skills», apart from Dual Blades and Holy Sword, were supposed to be unlocked after reaching the 90th floor.[2]
  • Kayaba Akihiko stated that Dual Blades was given to the player with the fastest reaction time. The chosen player was supposed to be the hero that would face him at the top of the 100th Floor.
  • Kayaba Akihiko also stated that there were only ten «Unique Skills» total, in contrast to the "unlimited" number of other skills.



Skills and Magic
Default Sword Skills
mostly common in SAO, New ALO, UW
Avalanche - Cyclone - Deadly Sins - Embracer - Explode Arrow[1] - Fell Crescent - Flashing Penetrator - Horizontal - Horizontal Arc - Horizontal Square - Howling Octave[2] - Lightning Fall - Linear - Meteor Break - Meteor Fall - Rage Spike - Reaver - Savage Fulcrum - Senda - Sharp Nail - Single Shot - Slant - Snake Bite - Sonic Leap - Spinning Shield - Star Splash[2] - Starburst Stream[3] - Treble Scythe - Tsumujiguruma - Tsujikaze - Ukifune - Vertical - Vertical Arc - Vertical Square - Vorpal Strike - Whirlwind
SAO Dual Blades - Extra Skills - Fishing - Hiding - Holy Sword - Searching - Sewing - Tracking - Unique Skills
ALO Original Sword Skill(Mother's Rosario (OSS))
Magic Butterfly Shield - Cold resistance spell - Concealment - Earth Wall - Fireball - Fire Spear - Healing Magic - Hit Point Buff Magic - Hollow Body - Ice Arrows - Metamorphosis - Moonlight Mirror - Night Vision - Purified Surface - Retrieve Arrow - Sacrifice - Searcher - Smokescreen - Strength Buff Magic - Vacuum Blades - Water Breathing - Wind Needles
Project Alicization Sacred Arts - Incarnation - Synthesis Ritual
  1. Only in ALO.
  2. 2.0 2.1 Only in SAO and ALO
  3. Only in SAO

Start a Discussion Discussions about Unique Skills

  • Remaining Undisclosed Unique Skills

    2 messages
    • Is it possible that the three of the four remaining skills not mentioned were also distributed along with Dual Blades and Holy Sword?  That ...
    • The manga does not matter, it's the Light Novel that is the prio1 canon. The manga is simply an adaptation, much like the anime is. ...
  • Darkness Blade

    6 messages
    • Alli
    • BlackHawkRA wrote:If anyone alive still possesses this skill, they're most likely a former member of Laughing Coffin. Not unless you'...
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