Chen Feng weighed the jaw piece in his hand.

Two palm-long metalized jaw leaves.

Gray and black in color, with sharp edges, this thing is a low-grade weapon material on the market and can normally be sold for two to three thousand.

He retracted the jaws into his personal space, squatted down, and used an engineering shovel along the Iron Jaw Gray Fly's torso to remove a few pieces of the still intact carapace.

The carapace is not easy to sell, but if you keep it, you might be able to make your own armor later.

His protective suit, which cost more than thirty thousand dollars, had been bitten through just now, so he had to find a way to reinforce it.

After doing this, Chen Feng stood up and looked up at the stairs at the end of the corridor.

The rooftop is right above, and you can go up to it in just a few steps.

But the question is...are there any iron-jawed gray flies on the rooftop?

The insect just now put too much pressure on him. It weighed 20 kilograms, had metal mouthparts, and exploded at an extremely fast speed.

He might win one on one.

But if after going up there, two or three of them pounce on each other...

His right arm is injured now, and he only has one and a half charges of white-turbid bullets left. He is really surrounded, and he may not even have the time to react to escape back to reality.

Chen Feng stood there, staring at the dark staircase, his mind spinning rapidly. After a moment, he had an idea.

The engineer's shovel was pressed against the wall and he tapped it three times.

Clang, clang, clang.

The sound was not loud, but it spread out in the empty corridor and bounced back from the surrounding concrete walls.

Chen Feng held his breath and listened.

If there were iron-jawed gray flies on the rooftop, this kind of movement should be able to attract their attention.

Time passes slowly.

Five seconds, ten seconds, thirty seconds...

It was quiet at the top of the stairs.

Chen Feng knocked again, this time a little harder, but still no movement.

"It seems there is none."

Chen Feng breathed a sigh of relief, held the engineer shovel tightly, half-crouched, and cautiously climbed the stairs.

At the end of the stairs was a rusty iron door with a rotten lock.

Chen Feng leaned sideways against the door frame and glanced first.

Outside the door is a rooftop.

It is nearly a hundred square meters, and there are all kinds of decayed debris piled on the ground, including broken clothes racks, broken flower pots, and an outdoor air conditioner that has long since been scrapped.

There are indeed no bugs.

Chen Feng then pushed open the iron door and walked out.

The pale moonlight in the sky shone down, barely illuminating everything on the rooftop.

He glanced around and finally landed on the northwest corner.

There was an abandoned flowerbed, surrounded by a crumbling cement fence. The soil inside was dark, and the surface was covered with a layer of fine gray-white mycelium.

And above the hyphae, there is a dense cluster of P. cinerea growing together, at least twenty of them!