P.A.L.E. G.A.S.

Once every century, the seven deadly sins gather together to decide on the next location for the Tournament to be the reigning Sin. This competition consists of each sin picking a candidate, since if they fought amongst themselves, then the mortal world would suffer to the point of being worthless; something none of them want to rule over is a worthless world. That means that the world would already be perfectly corrupt. After that, then what would be left for them to do?
To aid their challenged spirits, their human, mortal candidates are, ideally, the virtues to their vices, that is, the complete opposites of what they themselves stand for. The Vices then are required to use their candidates to wipe the others out, while also corrupting their souls.
The last candidate to remain untouched by their designated Vice is not only left alive, but granted the power to either rule for the next hundred years alongside their Vice, that means over the others as well, or to end the Tournament forever with just a word.
Never, since time has begun, has a mortal ever chosen to end the Tournament, for the ideal candidates, the ones that win who are the perfect virtues to their Vices, do not exist.
That is, until now.