After Luna accepted Nightmare Moon into her heart, the conflict between the two sisters grew wider. The harmonious queendom and its populace were split in two.

The mutation spreads through the queendom of the Moon, enhancing the ones it infects. The Order Argent kept the queendom of the Sun free of the corruption thus far but is at its limit.

As the tensions rise, the perpetual stalemate is bound to break

(I changed the description to something more streamlined and smaller after it was pointed out that I needed a better description.