A bit of backstory: I'm attempting to create a militaristic alien race composed of elite warriors capable of conquering the galaxy. They posses a variety of "enhanced" abilities such as immense strength, hearing, eyesight, agility, etc. There's quite a bit of diversity within the race itself, being composed of intermingling sub-classes which would allow for a skew of these abilities in one direction or another, but the main theme here is they all posses various types of traditionally predatory traits such as fangs and claws; however, additional things like scales or tails would be more sub-class specific.
My question is this: In accordance with what we know about the biology of predator species here on earth, humans included, what aspects are required/most likely to be present in this race as a whole in order to give them the warrior prowess they are famous for? Are some more vital than others? Any drawbacks?
This is inclusive of things like anatomy, hormones, and anything else that might be deemed useful. I realize this is a broad question so more specific instances are welcome too.