After a large influx of airborne forces joined the South, the campaign in the South accelerated significantly.
Although the Goblins were tough opponents, they were still Goblins after all. Prolonged battle would infect them with the plague, which they would then spread among their own kind.
The Goblins used a special method where once an individual was found to be infected to a certain degree, they would be eradicated.
Yet this method still couldn't completely solve the problem, and the plague continued to spread. The Beastmen controlling the Goblins from behind also felt extremely thorny as they kept retreating.
It seemed they were always gaining the upper hand, but in reality, that was not the case at all.
The spread of the plague and the environmental damage were worsening their situation progressively.