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.

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
 * 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

Comics

 * Flash (DC Comics); via Speed Force
 * Kid Psycho (DC Comics)
 * Superman (DC 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
 * Masane Amaha (Witchblade)

Literature

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

Films

 * Caleb (The Covenant); after his ascension.
 * Godzilla (Godzilla)

Live Action TV

 * 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}}

Known Powers

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