The ability to harden one's skin. Sub-power of Skin Manipulation. Variation of Dermal Armor and Body Hardening.

Also Called

  • Adamantine Kata (Kengan Ashua)
  • Blut Vene (Bleach)
  • Busoshoku Haki/Color of Armament Haki (One Piece)
  • Harden
  • Hierro/Iron (Bleach)
  • Skin Reinforcement/Toughening
  • Tekkai/Iron Body (One Piece)


The user is capable of hardening their skin, increasing their defensive and/or offensive capabilities.




  • Can be countered by Defense Break.
  • User may be slowed or rendered immobile while this power is active.
  • There may be a limit to how much damage the user's hardened skin can take.

Known Users


  • Greed (Fullmetal Alchemist); via Ultimate Shield
  • Nine Titans (Attack on Titan)
  • Kaku (Akame ga Kill!)
  • Svenkin Gatard (Black Clover)
  • Arrancar (Bleach); via "Hierro"
  • Quincy (Bleach); via "Blut Vene"
  • Cang Du (Bleach); via "The Iron"
  • Gremmy Thoumeaux (Bleach); via "The Visionary"
  • James Ironside (Blood+)
  • Ryuichi Sendo (Code:Breaker)
  • Ki Users (Dragon Ball Series)
  • Eclipse Pisces (Fairy Tail)
  • Greed (Fullmetal Alchemist)
  • Gabimaru (Hell’s Paradise: Jigokuraku)
  • Sylar (Heroes)
  • Chuuoh (Houshin Engi)
  • Hitomi Uzaki (Killing Bites); via her Therianthrope Form
  • Kongoh Family (Kongoh Bancho)
  • Crimson Riot (My Hero Academia)
  • Eijiro Kirishima/Red Riot (My Hero Academia)
  • Tetsutetsu Tetsutetsu/Real Steel (My Hero Academia)
  • Kakuzu (Naruto)
  • Fudo (Naruto: Shippuden)
  • Hiruko (Naruto: Shippuden)
  • Parasites (Parasyte)
  • Tsukune Aono (Rosario + Vampire)
  • Users of Busoshoku Haki (One Piece)
  • Users of Tekkai (One Piece)
  • Garon (Marchen Awakens Romance)
  • Ruin (The Seven Deadly Sins)
  • Tetsuhito Kagiroi (Tenjho Tenge)
  • Yaya (Unbreakable Machine-Doll)
  • Momotaro Tsurugi (Sakigake Otokojuku)


  • Superman (DC Comics)
  • Vision (Marvel Comics)
  • Ultimate Kevin (Ben 10: Ultimate Alien)
  • Kevin 11 (Ben 10)

Live Television/Movies

  • Ethan James (Power Rangers Dino Thunder)
  • Brass Body (The Man with the Iron Fists)
  • Ultimate Predator (The Predator)

Video Games

  • Sekka (Double Dragon V)
  • Steven Armstrong (Metal Gear Rising: Revengeance)
  • Parasite Units (Metal Gear Solid V: The Phantom Pain)
  • The Lone Wanderer (Fallout 3); via barkskin perk
  • Pokémon that can use Harden (Pokémon)
  • Pokémon that can use Iron Defense (Pokémon)
  • Pokémon that can use Iron Tail (Pokémon)
  • Ghirahim (The Legend of Zelda: Skyward Sword)
  • Ridley clone (Metroid: Other M)

Known Objects

  • Iron Boar (Spirit Animals)


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