Double-Edged Power

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 Cost/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
 * Higher Consciousness
 * Overburst Power
 * Power Manifestations
 * Sacrificial Protection
 * Singular Power Use
 * Suicidal Attack

Limitations

 * Some double-edged powers may affect people other than the user.

Known Users
See Also: Power At A Price.

Comics/Cartoons
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 * Mozenrath (Aladdin: The Animated Series); via Gauntlet
 * Avatars (Avatar: The Last Airbender); via the Avatar State
 * Gwen Tennyson (Ben 10)
 * Darkwing Duck (Darkwing Duck); via former use of Super Speed powers
 * Speedsters (DC Comics); via Speed Force
 * Kid Psycho (DC Comics)
 * Superman (DC's New 52); via Solar Flare, later Kryptonite energy infusion
 * Zombie Spider-Man (Marvel Comics); using his own veins and arteries as webbing causes him intense pain
 * 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
 * Masane Amaha (Witchblade)
 * Maul (Wildstorm Comics)

Literature

 * Dark Wizards (Harry Potter); especially when creating Horcruxes
 * Mundanes (Shadowhunter Chronicles); via Lilith's blood
 * The Sith (Star Wars)
 * Spirit Users (Vampire Academy/Bloodlines)
 * Fanoxean (The Young Guardians)

Movies

 * The Five Family Members (The Covenant)
 * Chase Collins (The Covenant)
 * Caleb (The Covenant); after his ascension.
 * Godzilla (Godzilla)

Live Television

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

Video Games

 * Asura (Asura's Wrath); via his Wrath Form
 * ADAM users (Bioshock)
 * Non-Belmont users of the Vampire Killer (Castlevania)
 * Power within users (Dark Souls)
 * Blood Mages (Dragon Age)
 * Crusader (Final Fantasy VI)
 * Users of the "Eyes of Etro" (Final Fantasy XIII-2)
 * Azura (Fire Emblem Fates)
 * Sora (Kingdom Hearts); via Anti-Form
 * Raziel (Legacy of Kain)
 * Mega Man (Mega Man 11); via Double Gear system.
 * Users of Phazon-Enhancement Devices (Metroid Prime 3: Corruption)
 * Pokémon that know "Perish Song" (Pokémon)
 * Pokémon that know recoil inflicting attacks (Pokémon)
 * Albert Wesker (Resident Evil)
 * Zephyr (Resonance of Fate)
 * Metal Sonic (Sonic the Hedgehog); via V. Maximum Overdrive Attack
 * Shadow the Hedgehog (Sonic the Hedgehog); without Inhibitor Rings
 * Shirou Emiya (TYPE-MOON); after fusing with Archer's arm
 * Shiki Tohno (TYPE-MOON)
 * Infeliz (Valkyrie Crusade)
 * Deathwing (World of Warcraft)}}

Known Objects
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Comics/Cartoons

 * Mozenrath's Gauntlet (Aladdin series)
 * Telecephaloscope (Blake and Mortimer - The Yellow "M")
 * The Red Sweater of Courage (Dave the Barbarian)

Anime/Manga

 * The Berserker Armor (Berserk)
 * Bakkōtō (Bleach)
 * Most Cursed Tools (C3: CubexCursedxCurious)
 * Wish Tickets (Majimoji Rurumo)
 * Darkness ÄRMs (Marchen Awakens Romance)
 * Ghost ÄRMs (Marchen Awakens Romance)
 * Mobile Suits equipped with Trans-Am (Mobile Suit Gundam 00)
 * Akimichi Three-Colored Pills (Naruto)
 * Hero Water (Naruto)
 * Energy Steroids (One Piece)
 * Hero Water (One Piece)
 * Reject Dials (One Piece)
 * Rumble Ball (One Piece)
 * Silver Crystal (Sailor Moon)

Literature

 * Soulcutter (Book of Swords)

Video Games

 * Beast Spear (Breath of Fire III)
 * Boots of Blinding Speed (The Elder Scrolls III: Morrowind)
 * Kōkai Gyoku (Flame of Recca)
 * Double Gear System (Mega Man 11)
 * Phazon Enhancement Device (Metroid Prime 3: Corruption)

Live Action Television/Films

 * The Mark of Cain (Supernatural)}}

Known Powers

 * Project Daycare (American Dad!)
 * Lucid Gadget (Dream Eater Merry); when used in reality
 * Fairy Law (Fairy Tail)
 * Blastor Mode (Tekkaman)
 * Stands (JoJo's Bizarre Adventure)