Double-Edged Power


 * For a gallery of examples for Double-Edged Power, see here.

The circumstance in which the user possesses great strength and ability at a cost. Not to be confused with Aversion.

Also Called

 * Equivalent Exchange
 * Faustian Powers
 * Power at a Price

Capabilities
The user possesses great skill and power, but prolonged usage of it may come at a cost. Overuse or misuse of said power may result in, among other things, insanity and physical damage to the user's body.

Associations

 * Concept-Dependent Immortality
 * Feral Mind
 * Over-burst Power
 * Power Manifestations
 * Suicidal Attack
 * Higher Consciousness

Known Users
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Literature

 * Soulcutter (Book of Swords)
 * Mundanes (Shadowhunter Chronicles); via Lilith's blood
 * Spirit users (Vampire Academy/Bloodlines)

Films

 * Various Sith (Star Wars)
 * Dark Wizards (Harry Potter); especially when creating Horcruxes
 * Caleb (The Covenant); after his ascension.
 * Godzilla (Godzilla)

Western Television

 * Sam Winchester (Supernatural); via Demon Blood
 * Users of the Mark of Cain (Supernatural)
 * Castiel (Supernatural)
 * Sylar (Heroes)
 * Peter Petrelli (Heroes)
 * Mohinder Suresh (Heroes)
 * Willow Rosenberg (Buffy the Vampire Slayer)
 * Cordelia Chase (Buffy the Vampire Slayer and Angel)
 * Magic Users (Once Upon A Time)
 * Dr. Curtis Williamson (Charmed)

Western Animation

 * Avatars (Avatar: The Last Airbender); via the Avatar State
 * Mozenrath (Aladdin: The Animated Series)
 * Darkwing Duck (Darkwing Duck); via former use of Super Speed powers
 * Gwen Tennyson (Ben 10)

Comic Books

 * Kid Psycho (DC)
 * Flash (DC); via Speed Force
 * Zombie Spider-Man (Marvel); using his own veins and arteries as webbing causes him intense pain
 * Masane Amaha (Witchblade)

Manga/Anime

 * Julie Sigtuna (Absolute Duo)
 * Kyouka (Fairy Tail)
 * Ultear Milkovich (Fairy Tail); via Last Ages
 * Alchemists (Fullmetal Alchemist)
 * Alphonse Elric (Fullmetal Alchemist)
 * Edward Elric (Fullmetal Alchemist)
 * Goku (Dragon Ball); via Kaioken
 * Ultimate Shenron (Dragon Ball GT)
 * Saiyans (Dragon Ball); via Great Ape form
 * Naruto Uzumaki (Naruto); via former usage of Rasenshuriken and Fox Shroud
 * Sasuke Uchiha (Naruto); via former usage of Cursed Seal of Heaven and Mangekyo Sharingan
 * Sharingan users (Naruto); via use of Izanagi and Izanami powers, losing sight in the eye forever
 * Rock Lee (Naruto); via opening the Eight Inner Gates
 * Might Guy (Naruto); via opening the Eight Inner Gates
 * Tsunade (Naruto); via the Creation Rebirth Technique
 * Kakashi Hatake (Naruto); via former use of Sharingan eye
 * Cursed Seal users (Naruto)
 * Monkey D. Luffy (One Piece); via Gear Second
 * Tony Tony Chopper (One Piece); formerly over-dosage of the Rumble Ball (pre-timeskip), now able to need only one for Monster Point
 * Marshall D. Teach (One Piece); more susceptible to pain via gravity-element drawback
 * InuYasha (InuYasha)
 * Miroku (InuYasha)
 * Humans who make a deal for the Shinigami Eyes (Death Note)
 * Ichigo Kurosaki (Bleach); via using the Final Getsuga Tensho and controlled by hi hollow self.
 * Sajin Konamura (Bleach)
 * Uryu Ishida (Bleach); via taking off the Sanrei Glove
 * Bakkōtō users (Bleach)
 * Yukishiro Enishi (Rurouni Kenshin)
 * Seidou Goui Users (History's Strongest Disciple Kenichi)
 * Hatsuna Wakabayashi (Gokukoku No Brynhildr)
 * All ability users and Rare Kinds (Code: Breakers)
 * Sailor Saturn (Sailor Moon); using her full destructive and deathly powers also causes her to perish
 * Dark Schneider (Bastard!!) via Judas Pain
 * Kazuma (s-CRY-ed)
 * Refined Alters (s-CRY-ed)
 * Hiei (Yu Yu Hakusho); via using the Kokuryuha
 * Ruby Tojo (Rosario + Vampire) via Iron Maiden
 * Tsukune Aono (Rosario + Vampire)
 * Negi Springfield (Mahou Sensei Negima!) via Magia Erebea
 * Refal (Legend of the Legendary Heroes)
 * Shana (Shakugan No Shana); via Tenpa Josai
 * Eli Shane (Slugterra); using the double barrel with the wrong slugs for a fusion shot could cause disastrous results like draining all the energy of surrounding slugs or worse.
 * Gene Starwind via use of #4, #9, and #13 Caster Shells (Outlaw Star)
 * Contractors except Hei (Darker than Black); they required to perform a task in order to use their powers
 * Est Contractors (Spirit Elementalist's Blade Dance)

Video Games

 * Shadow the Hedgehog (Sonic the Hedgehog); without Inhibitor Rings
 * Fanoxean (The Young Guardians)
 * Asura (Asura's Wrath)
 * Deathwing (Warcraft)
 * Non-Belmont users of the Vampire Killer (Castlevania)
 * Users of Phazon-Enhancement Devices (Metroid Prime 3: Corruption)
 * Sora (Kingdom Hearts); via Anti-Form
 * ADAM users (Bioshock)
 * Pokémon that know recoil inflicting attacks (Pokémon)
 * Pokémon that know Perish Song (Pokémon)
 * Albert Wesker (Resident Evil)
 * Shiki Tohno (TYPE-MOON)
 * Shirou Emiya (TYPE-MOON); after fusing with Archer's arm
 * Raziel (Legacy of Kain)
 * Zephyr (Resonance of Fate)
 * Blood Mages (Dragon Age)
 * Power within users ("Dark Souls")}}