What Donna described was a hard-and-fast rule of the Singer Civilization, a rule of the game that even the Silver Federation had to obey.
The reason the Singer Civilization encouraged wars between bottom-tier civilizations like Blue Star was not only to plunder psionic energy along the way—seventy percent of Blue Star's psionic energy had been taken by the Singer Civilization—but also because it carried the implication of "raising gu" to determine which civilization had greater potential for development.
If Skrull Star won this war, they would become the "civilization with greater developmental potential." If they lost, Blue Star would take their place as the "civilization with greater developmental potential."
Assuming Skrull Star won, after devouring Blue Star, they would gain a window for rapid development.
After one or two thousand years, once they had completely digested and absorbed Blue Star and raised their civilization level from 1.2 to above 1.5, the Singer Civilization would match them with another "evenly matched opponent" for another war.
What followed would be endless "gu refining."
If the Skrull civilization was lucky enough to keep winning its subsequent wars, its strength would continue to grow.
Once their overall civilization level rose from 1.5 to above 3—like the Silver Federation, which was a level 3.1 civilization—they could escape the fate of being gu and become loyal enforcers of the Singer Civilization, becoming the dominant race that controlled an entire star system.
Of course, the path of "raising gu" was not easy. Becoming a level 3 civilization required at least thirty wars, and one misstep could reduce the entire civilization to ashes.
Returning to the mindset of the Singer rulers, since they wanted to determine a "civilization with greater developmental potential," they had to ensure relative fairness between the two sides in the contest.
If fairness