I may as well clarify some things about magic while we wait
Siphon Magic ---
It goes by its name. Users of this magic literally siphon the mana out of their surroundings and use it to cast spells. This also means that siphon users have an infinite amount of mana, but have to charge their attacks. Also, they can't use too much magic or else their bodies are affected in a negative way. They can only channel magic power to the end of their hands and feet.
Runic Magic ---
Uses pre-drawn runes to perform a magic function. Runic mages or witches store mana inside them and can channel it to any area of their body. Runes drawn on the body have to have magic channeled to, although runes which are inscribed into the blood are passively activated. Runes can also be inscribed onto objects, but cannot be controlled separately.
Sound Magic ---
The most dangerous of the three magics -- not because of it's danger to other people, but by it's pure unpredictability. Sound mages use a catalyst to perform their magic, a catalyst which can make a sound. Usually this is an instrument like a guitar but can be other things as well. The most common sound attack is a shockwave of sound, which is powerful in it's own right -- but can be easily blocked. Sound mages have special abilities which they are born with, which creates the destructive side of sound magic. Some sound mages have even been noted to control time itself.
The COLOR contest (global) ---
A contest held in the capital of the world -- the City of Madness. Three Siphon users, three Runic users, and three Sound users duke it out for the main prize -- access to the highest area of knowledge in the world, The Data Zone. Points can be earned in different ways. Beating another color will earn points, but losing to another color will lost points. Going dungeon crawling will gain points as well.
Overall, it's a contest between magical girls for access to near-infinite knowledge. It's dangerous -- many contestants have been known to die, but many consider it worthwile -- if you get picked, of course.
Bizarre Slime (of what Violet knows) ---
Bizarre Slime is believed to be the origin of life -- the Primordial Soup. It is the most sought-out substance in the world, as it is believed to grant any wish. It is also believed to contribute to the creation of monster girls, as when a creature is placed within it with the human genome it transforms into a monster girl. The monster is almost always female because the slime synthesizes a pure sex chromosome pair -- two X chromosomes. Not much knowledge has been known of it, but it is believed to be found in trace amounts in some of the most remote places on the earth. Only one actual human has been known to have been created from Bizarre Slime -- Violet Whiplash. (not you, someone else). Violet Whiplash also happened to be a winner of one of the color contests a while ago, and still lives on today. It is possible that others have been created as well, but have not been recorded.