With the requirement to evolve into the Killer Prodigy race, it's without a doubt that this class is going to be the most avoided class out of the others. Even for Pati, the requirement is pretty specific and tight.
In order to become the Killer Prodigy race, killing something is already expected.
But who would've thought that the requirement for evolution demanded Pati massacre an entire colony of human survivors which means no survivors? On top of that, the next requirement specifically asks him to kill an adolescent human.
Despite the absurdity of the requirement, Pati knows why this becomes a requirement.
Simply put, a Killer Prodigy will need to have zero sympathies for everyone that he/she killed. What better way to test that than by killing a kid? It's the ultimate struggle that even Pati finds pretty harsh just to evolve a race.
Not just anybody can kill a kid, that requires a stronger mental fortitude than just killing anybody.