Iridescent Blaze

Iridescent Blaze (焔の虹色, Homura no Nijiro) is a subspecies of Fire Magic utilizing flames with unique properties, indicated by their individual color.

Overview
As previously stated, Iridescent Blaze is a magic that allows the user to create and manipulate flames, each with unique properties, indicated by their individual color. Iridescent Blaze can be used in two ways, the first is the Casting Method (鋳造方法, Chūzō Hōhō), in which the user can either externally or internally focus their aura to generate and manipulate multi-colored flames. The second is the Holding Method  (手触り方法, Tezawari Hōhō), in which the user channels their aura into a item either infused with an blazing lacrima or magically enhanced to create a magical effect. Each of these two means will bring a mage to similar results: The ability to generate and control multi-colored, not to mention their own flame-based spells. Additionally, it seems like users of this magic have a stronger tie with their flames, thus it is more difficult for users of Pyrokinesis to control their flames.

Iridescent Blaze is incredibly versatile, allowing the user to create powerful flames for a variety of usages ranging from rudimentary constructs to raging flame vortexes and many things in between. Each colored flame has a unique effect or ability, varying from basic healing properties to stickiness to even causing hallucinations. Beyond the creation of these colorful flames, the most basic spells are in the form of powerful bursts and torrents of flame as well as fiery vortexes. The generated flames can be manipulated into many rudimentary constructs such as such as blades, tendrils, arrows, bullets, barriers, domes, and spheres. Under the guidance of a mage, the fire can even be given a seemingly solid consistency to form basic defensive spells. Additionally, a user can manipulate the natural temperature of the flames from a low roasting 750°F to a blazing 2,800°F, a temperature nearing the melting point of iron. In a more supplementary fashion, mages are capable of shrouding and turning their own body into flames, as well as generating flames on their feet or palms, in order to achieve temporary flight and high-speed movement through jet propulsion. The flames created with Iridescent Blaze burn for around three minutes on average, by using more of their magic power, a user can cause their flames to stay alight for several hours on end. Interestingly enough, though a user of this magic is capable of blending all twelve colors together, it seems to act like regular fire, as the differing capabilities of each flame counteract each other.

As far as relations with the other elements go, Iridescent Blaze is connected greatly to its forefather, Fire Magic as well as Heat Magic, allowing mages the possibility for combination spells. As assumed, Iridescent Blaze can fall weak to water-based magics, including and its Slayer Magic counterparts, however if a flame is hot enough, it is capable of evaporating the water. Not to mention, certain colored flames have countermeasures against water. Since this magic revolves around the effects and abilities of the flame, each color has ties to different magics, once again, giving them a variety of effects, thus making Iridescent Blaze, a fantastically versatile magic.

Trivia

 * This is the author's own interpretation of Canon's Rainbow Fire.
 * The flame properties are partially based on the Seven Flames of The Sky from Katekyo Hitman Reborn as well as the author's own opinions.