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«Sharp Nail» (シャープネイル, Shāpu Neiru?) is a 3-hit, One-Handed Sword category Sword Skill in Sword Art Online, New ALfheim Online and Project Alicization.


«Sharp Nail» begins with a diagonal slash from the bottom-right to top left, followed by a horizontal slash from left to right.[1] Finally, the skill is ended with another diagonal slash from top-right to bottom-left.[1]

An alternative execution of the skill begins with a nearly vertical slash from the user's left shoulder, hitting the target's right side, after which the sword instantly shoots back into a high position and slashes vertically again, hitting the target's left side, then leaps up again and slashes vertically at the centre of the target.[2]


Instance Description
Light Novel Anime Manga
Progressive Volume 2, Concerto of Black and White, Part 7 N/A After dodging Morte's attack with his axe, Kirito hit Morte with Sharp Nail, reducing his hit points to just a bit above fifty percent.
Progressive Volume 3, Barcarolle of Froth, Part 8 N/A Having knocked Kirito's «Anneal Blade» backward, a Forest Elven Inferior Knight activated Sharp Nail, but Kirito used his sword to block all three attacks with a two-handed block, leaving the knight open for Kirito's counterattack with Horizontal Square.
Volume 2, Red-Nosed Reindeer, Part 1 N/A N/A Kirito used this skill against an ant in the Ant Hill on the 46th Floor, killing the ant.
Volume 9 Chapter 1 Part 4 Alicization Episode 04 Kirito used this skill against Ugachi, severing the goblin's left arm with the skill.



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 - Tailoring - 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