As this is the final round, it shall have a rather difficult theme. To make up for this, though, you are given two months to accomplish your masterpiece.
Your task in this round is to create a remix based on one or more themes associated with a single villain from any RPG. The theme must be of some significance to the character. However, you cannot use the character's main theme. For example, you choose Seymour of Final Fantasy X as your villain; you cannot use Seymour's Theme, but you may choose, say, Fight With Seymour, Seymour's Ambition, or perhaps even Guadosalam or Challenge (though this was used in both the battle against Seymour Flux and and the one against Yunalesca). Be careful, though, as deductions may be given to those pieces which will use themes that are deemed too loosely associated with your chosen villain. Also, you must include at least one original theme in your remix. This takes the Creativity criterion to a whole new level, does it not?
The remix must also utilize a concerto instrumentation setup, i.e. there must be a solo instrument (or instrument group) accompanied by a supporting instrument group. You can go for something as ancient as a solo violin accompanied by a string orchestra and a harpsichord to something as modern as an electric guitar supported by synth brass, drums and "laser beam" sounds.
The judges for this round shall be yours truly, Francis "Fermat's Last Theorem" Gayon (Sound Test Curator), Mikel "Firemyst" Tidwell (President and Lead Programmer), and Michael "Macstorm" Cunningham (Editor-in-Chief and Public Relations).