Forged Destiny [Book 9: Ch. 10]

Little black masses like worms that twisted and convulsed on the floor. One split open on its side and a tiny Grimm creature burst forth, tiny mandibles stretched as it screeched toward the sun.

[...]

A man roared in pain as one of the small insectoid creatures proved itself more dangerous than its size suggested, latching on and burrowing into an exposed piece of flesh between his shoulder and armpit. Its tail wiggled as it tried to dig into him, working almost half its body length inside.

[...]

A hiss and a screech was my first warning of the boy's pursuer. I caught the horrible little thing in my hand and winced as it bit down, instantly trying to burrow into skin. A brief flash of Stoke the Forge put an end to that. It popped like a gory little balloon, spraying ichor and blood out in front of me.

[...]

Thirty little sets of mandibles screeched at me, several more of the things bursting from pockets of bulging skin and blood. Gagging, I swept the torch before me, making it whoosh in the air.

The things shied back.

I'd been right. They were weak to fire.

Weak, but unafraid. While they shied back initially, they refused to leave the body and lunged forward when I came too close. I knelt, holding the torch before me like a shield. The things crackled and popped when they came close to it, splattering in little explosions of blood and pus. Not one of them survived.

—Forged Destiny [Book 9: Ch. 10]