Slab

Slab is a dragon that was captured by the Dragon Hunters and is used to fight prisoners for the Hunter's entertainment.

He is shown to have the Elemental Power of Earth, and is not weak to vengestone.

Iron & Stone
In Slab's first appearance, he appears as part of the Dragon Hunter's entertainment, where he is put in The Pit with a prisoner, and he is expected to kill them. In this episode, Zane, Kai, and Jay are thrown into the Pit, and Slab is put to fight them.

He is shown to chase them around the Pit for some time, until Cole and Wu throw the Ninja a chain to subdue him.

While on the ground, Slab is about to blast Jay with his earth breath, when Zane uses his Elemental Power of Ice to save him, and freeze Slab's head.