Double-Edged Power

"Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost. That is alchemy's first law of Equivalent Exchange. In those days, we really believed that to be the world's one, and only truth."

- Alphonse Elric (Fullmetal Alchemist)

"All magic comes with a price!"

- Rumpelstiltzkin (Once Upon a Time)

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.
 * They may require something to keep their limits restrain.
 * With enough training, they may be able to overcome.

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)
 * Thaddeus Sivana (DC Comics' New 52)
 * Superman (DC Comics' New 52); via Solar Flare, later Kryptonite energy infusion
 * Spark (Girl Genius); there's a reason it's called The madness place.
 * 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
 * Maul (Wildstorm Comics)
 * Masane Amaha (Witchblade)

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)
 * The Sword of Tengu (Teenage Mutant Ninja Turtles 2003)

Anime/Manga

 * The Berserker Armor (Berserk)
 * Bakkōtō (Bleach)
 * Most Cursed Tools (C3: CubexCursedxCurious)
 * Wrath/Sasajima Kyouya (Kumo Desu ga, Nani ka?)
 * 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 Television/Movies

 * The Mark of Cain (Supernatural)}}

Known Powers

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