Dragons.
A race, known for its godly might and unrivaled strength throughout the limitless galaxy.
The Relationship between Dragons and Humans wasn't in any way a master-slave relationship as even the Humans knew well the dragons were not in any way weaker than them and most probably even stronger, but fortunately, the dragons are somewhat of a lazy race and greatly piqued their curiosity when Earth suddenly appeared in the galaxy.
It was this curiosity that led to the somewhat good relationship between the dragons and Humans as allies.
While the dragons might be the mightiest of races, there are different types of dragons even in the dragon world with some being strong and others not focusing on strength much.
One of these strong dragons was the Chaos Dragons. Why were they called Chaos Dragons, it is simply due to their ability to absorb a special type of energy in the air. An energy called dark matter.