The ability to make any layer/surface much harder without losing any mobility. Opposite to Fortitude Weakening.

Also Called

  • Hardening


User can make any layer/surface much harder without losing any mobility through whatever means, either as a whole or only partially.


  • Corporealization: Make immaterial aspects that are normally substanceless more than solid.
  • Deflection: Refining defensive properties to rebound or reflect for various purposes. 
  • Dermal Armor
  • Internal Reinforcement
  • Skin Hardening
  • Solidification
  • Continually harden an object without increasing its mass.
  • Reinforcing blunt force weapons.
  • Hardening air to walk on or creating a barrier.
  • Increase the damage of a strike without losing any momentum.
  • Alter the sharpness of certain objects (i.e. cardboard or paper) by hardening/compacting molecular lattices.




  • Hardened objects may allow light and other particles to pass through.
  • May be limited to certain objects or materials.
  • May require constant contact with the object or the effect disappears.

Known Users

  • Akatsuki Ousawa (Aesthetica of a Rogue Hero)
  • Hellas (Aldnoah.Zero)
  • Dioscuria (Aldnoah.Zero)
  • Poison Ivy (Batman: Arkham Knight)
  • Irene Belserion (Fairy Tail); via Enchantment
  • Shirou Emiya (Fate/stay night)
  • Medea (Fate/stay Night)
  • Greed (Full Metal Alchemist)
  • Lightning Flame users (Katekyō Hitman Reborn!)
    • Gamma
    • Lambo
  • Behemoth (Knights & Magic)
  • Parasite Unit/Skulls (Metal Gear Solid V: The Phantom Pain)
  • Isaiah Mustafa (Old Spice Commercial)
  • Busoshoku Haki users (One Piece)
  • Tekkai users (One Piece)
    • CP9 members
    • High Ranked Navy Officers
  • Yomiko Readman (Read or Die); limited to paper
  • Akio Fudo (Trinity Seven)

Known Objects

  • X-Ionizer (DC Comics)
  • Maw Installation (Star Wars)