The parasitic species were extremely troublesome. The first Contractor to appear had been killed by them. As a branch of the first echelon among the alien species, the parasitic species might not look impressive, but they were top-tier assassins and infiltrators.
After parasitizing someone, they not only seized control of the body, but also used their own nerves to connect to the victim's brain.
The reason the humans of this world had suffered so terribly in the first place was because of the parasitic species. They disguised themselves as high-ranking human officials and sabotaged the humans' advanced weapons, power supplies, and so on.
Less than a minute after the defensive battle began, a mound of corpses formed by Groundwalkers appeared in front of Su Xiao. Since the Contractor beside him had just died, even more Groundwalkers pounced at him.
The benefits of accumulating passive abilities showed themselves at this moment. After Su Xiao activated Blade Shadow Burn, he killed one Groundwalker with each slash. If the Groundwalkers were close enough together, one slash could kill two or three.
Killing parasitic species granted merit, while killing Groundwalkers did not. Of course, this might have been because he had killed too few of them.
One Groundwalker after another rushed over the corpses of their comrades and pounced at Su Xiao. Just as Su Xiao was about to swing his blade, a heavy pressure appeared above him.
With a swish, Su Xiao cut four Groundwalkers in half. Although one of them had only its upper body left, it still opened its huge mouth and bit down on Su Xiao's left arm.
A feeling of restraint and pain came from his left forearm. Su Xiao swung the hilt of his blade down, smashing the Groundwalker biting his forearm. Its skull shattered, and blood and