The users can generate and manipulate the cursed flames of Hell, which can completely destroy anything. The color of the flames varies, but may be black, blue, white, or the normal shades of fire, although probably in some way noticeably unusual. Sometimes, the flames are not generated, but instead summoned from the depths of Hell itself.
Hell-fire can cause excruciating pain upon contact or instead cause instant death, possibly even for relatively beneficial purposes, such as summoning spirits of the deceased temporarily back to the world of living from Hell. Some users can even use Reanimation or Resurrection via Summoning the damned and/or Demons.
The Azure Flame (Code:Breaker), also known as Satan Blaze, can burn all physical matter to nothingness. It burns away the sin of wrath. The price to pay for using this flame is the sense of taste.
Belphegor (Code:Breaker), the Black Flame of Limbo, can burn away special powers. It burns away the sin of sloth. The price to pay for using this flame is an internal organ, but a special power may be taken as substitute.
...Mammon, dual colors of green and yellow, are hot and cold, and carries an incredible concussive force that can be highly explosive. It burns away the sin of greed...
...his true form is the Dichromatic Twin Flamberges of the Netherworld, and can be turned into dual blades of the two different colors, which can be used to create whirlwinds via ambient pressure differences.
When uncontrolled, Beelzebub (Code:Breaker), devours life force of all around it, including the wielder. It burns away the sin of gluttony. The price to pay for using this flame is the user's heart will be consumed upon death.
...When controlled, it becomes enter its Seraphim's form, an achromatic flame that can burn invisibly at 1500 degrees Celsius...
...Once gaining complete control of Beelzebub and fusing with it, it becomes the Achromatic Catharsis Flame of Purgatory and the wielder of the Flame of Judgement, which can call forth invisible flames of intense temperature that can disintegrate everything, but the user will suffer recoil of the same intensity.
Leviathan (Code:Breaker), the Argentous Phantom Flame of Hades, is silver colored, and removes the heat from the area to freeze its target, placing it in hibernation state. It burns away the sin of envy. The price to pay for using this flame is the envy of the user's enemies.
Asmodeus (Code:Breaker) traps anyone she burns into an eternal illusion of lustrous dreams, never again to regain consciousness, while assimilating the victim's body into her own, eventually killing them. She burns away the sin of lust. The price to pay for using this flame is the sense of smell, though she can betray a contractor if she is aroused by another...
...his true form, the Iridescence Explosive Flame of Hell, chemically reacts with the surrounding alloy, to create a violently deafening explosion of differing colors.
Lucifer (Code:Breaker), the final of the seventh flame, is an evolved form of the Satan Blaze, controlling and amplifying all other six flames to burn anything, even nothingness, to ashes. The price to pay for using this flame is the user's memories.
Fiendfyre (Harry Potter) is an immensely powerful curse which summon forth enchanted hellflames that can burn and destroyed anything including an intangible soul bounded into a Horcrux.