Colours of Magic: Orange (d20)
The power of Orange is in the ending¸ changing or manipulating of things. Those that master it can destroy¸ polymorph or change matter according to their whim.
"Some few have the magical potential and right mindset (some might say wrong mindset) to draw power directly from the colour Orange. This ability usually ends up twisting them somewhat… if they were not already twisted. Those who persevere in this power might become Unmakers¸ a class that others might describe as a bunch of homicidal maniacs bend on destroying the universe.