Capítulo 507: The Boulder Crab - Part 5

They took a second to focus, as they took in Oliver, and soon Verdant as he arrived behind him. Then, in a shower of rubble that fell from its back as it arose, it let loose a deafening roar, getting its legs under it.

Those legs were just as stony-looking as its body. The book said that it wasn't actual stone that the creature was made out of, but a grey carapace that was equally as hard. Those that nested for a while would often awake with calcium deposits on their body, as their own naturally occurring minerals reacted with the soil and stones that fell on them.