Answer:
What weaves webs as they grow?
Its title means book.
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?