The ferocious beast was called the Vajra Earthwalker Sub-dragon.
It was nearly a thousand meters long. Its thick limbs, like thousand-year-old bronze pillars, supported its low, broad body as it raced along the ground.
Its entire body was covered in blue-black, diamond-shaped scales. The edges of each plate curled outward like blades, and mottled iron-red rust had crusted over their surfaces.
Those were the marks left by years of burrowing through mineral veins and layers of lava. Tiny crystal fragments were embedded between its scales, clicking softly as it moved.
Its eyes were hidden beneath heavy bony brows. Its pupils were a murky ocher, but now a trace of savage red light shone within them.
Three ridges of bony spines rose along its back, their tips worn smooth and gleaming.
They were its tools for clawing through rock strata and smashing through mountain walls.
Most terrifying were its clawed feet. Five sharp talons, like hooks forged from refined iron, dug deep into the rocky ground, sending stones flying with every step.
When its limbs pushed off the earth, even the ground trembled, as though a moving iron fortress were passing by.
That was right. The Vajra Earthwalker Sub-dragon usually lurked beneath the earth.
It had survived in the lightless depths underground, and that was what had given it skin of such incredible toughness.
It had come out this time for one reason only: to hunt.
The savage red light in its eyes was proof enough that it had come to hunt.
But Lu Yuan's Spiritual Power was so strong that he had a Spiritual Barrier of his own, which was why the Vajra Earthwalker Sub-dragon had failed to detect him.
So it simply headed toward Lu Yuan without any particular aim.
Suddenly, it lowered its head and gazed down at