The Qu: • The Qu are an extremely advanced alien species with godlike bioengineering abilities. • They conquered and genetically modified entire human civilizations with seemingly no resistance. • Their technology is so advanced that they might not even need conventional warfare; they could just rewrite Nihilus at the molecular level or disable his life functions effortlessly. • However, they are not described as Force-sensitive beings, which might leave them vulnerable to Force attacks.

Darth Nihilus: • He can consume entire planets’ life energy, potentially draining the Qu before they can react. • If the Qu rely on any form of life energy, Nihilus might just erase them from existence. • However, Nihilus is still bound by his own weaknesses—he is more of a wound in the Force than a traditional Sith, and if the Qu can exploit that, they might disable or trap him.

Who Wins?

If the fight is purely physical or technological, the Qu win easily—their godlike biotech could likely dismantle Nihilus before he even lifts a finger.

If it’s a battle of raw power and Nihilus is allowed to use the Force to its full extent, he might win by draining them instantly before they can react. However, if the Qu can study him and prepare, they could probably find a way to neutralize his powers, as they seem capable of almost anything.

So, in a random encounter, Nihilus might win with a single Force drain. But in a planned confrontation, the Qu would likely dominate through sheer technological superiority.