"It seems like this crab's strength isn't very impressive, it's just that its size combined with its impenetrable physical defense is a bit troublesome." After fighting for a while, Lin Yucha finally noticed the differences between the two.
The crab's physical attacks were strong, but it was very clumsy in movement. With a Death Scorpion causing trouble nearby, the result was that the giant crab couldn't affect the Heavenly Disaster Demonic Dogs at all.
Similarly, the crab's defense was extremely robust, that shell wasn't just for show.
If it were an ordinary crab, it wouldn't matter if its shell couldn't be cracked, as long as it was possible to destroy the insides using vibrating forces. However, this giant crab itself was a quake-type Heavenly Disaster Beast, and it controlled vibrating forces exceptionally well.
It was good enough that the giant crab didn't use vibrating forces against other creatures, but to inflict damage on the giant crab with vibrations was impossible.