The humans, for all their faults, had managed to wipe out over half the races that made up their enemy.

Let us enlighten our foes to the unyielding spirit of mankind. Within all of your veins flow the blood of generals, soldiers, and murderers.
Shred their bodies with a storm of lead!
Tear their organs out with your bayonets!
Crush their skulls underneath your iron boots!

SLAUGHTER THEM ALL!

Luckily, a surge in student murmuring mostly swallowed my lack of composure. I got a few seconds before the next question came and tried to pull myself back together.

"So does it still feel good? This sex thing?"

The sound of the rifle firing was heard, and the beam of light left the weapon and struck Fredric, who didn't even flinch.

"Fun fact about humans, you see, the star around the world that we originated from emits an insane amount of radiation. Much of it is more lethal than the radiation that you just fired at me."

“Those Who Run?”

He laughed. “Not quite,” he said. “That was a mistranslation from a malfunctioning device. By the time we realized the error, it seemed too trivial to correct.”

“A mistranslation?”

He smiled, and for the first time I noticed the sharp teeth at the corners of his mouth. “It’s not Those Who Run,” he said.

“It’s Those Who Chase.”

The answer to that scared two of our scientists so badly that they went puce for three whole cycles. You see, these hell-creatures are able to easily work materials that are so far down at the bottom of our periodic table that it’s just not worth even trying. They can create and utilise compounds containing iron, and even titanium. I swear upon my progenitors, I am not making this up.

"Oh. But your ship. It's so powerful?"

"No, yours are just weak. I used a few mining lazers and it cut through your shields like butter, I through a few asteroids to soften you up, though I don't really think I needed that. And your ships aren't even built to handle a basic tractor beam. Honestly I'm still not convinced you're actually from some military. I still think you're trying to bluff me. Even Human pirates have better equipment than you."

When every single Vendriq in the capital was killed, the legion spread out. Operating in two-man teams, they spread out across the planet like a virus. In the wake of each team, the dead were left mangled and piled. When it was all said and done, the thousand members of the Legion of the Damned reconvened in the capital. Not a single member of the Legion had fallen, but millions of the Vendriq had.

The Shriike aboard weren't just slaughtered. They were hurt. Tortured. Civilians, females, young. The males were crucified.

"We use AI to regulate contracts between different parties in our worlds. These contract chips ensure that the contracts are fully carried out, otherwise the AI provides a suitable punishment. In this case since I'm sparing your lives after you tried to kill me, it would probably result in death."

"That's fine. What do you want us to do?"

"You'll be working for me. How long do your people live?"

"We have 23 races in our fleet, though I'm not sure how many are left, but the average lifespan is about 60 years, with ranges between 20 and 100."

"Good, I'll have all of you work for me for... Lets say 20% of your total lifespan, or 60% of your remaining lifespan whichever is less. The details will be in the contract. I'll provide food, lodging etc. but you will not receive pay."

"I don't think we have a choice do we?"

"No."

Purposeful genocide was committed for 4 months. And estimated 50 billion Gra'var drowned to death in the hulks of their ships. After the genocide was done, the human ships glassed the planet for good measure. The Gra'var offered their surrender. It was ignored.

You mentioned using claws on human necks. Actually, human necks are pretty well protected by muscle and bone structure. Your claws would probably get caught in the muscle before reaching anything important.

The humans avoid war because it would be too easy for them to win.

https://www.reddit.com/r/HFY/comments/nw4o31/galactic_daycare/

I find this series entertaining. Less "humans are orcs" and more "humans are community builders"

Before anyone could answer a Marine officer yelled across the room "Bring it on cock lips. You fucked with our boats and now want to try and fuck with our new found allies, you got another thing coming." Boats refer to water faring ships on Earth and Cock is slang for Human male genitalia. The term Cock lips infers that the opposing has committed oral sex acts.