Pyroxx, home of Wrexx , is a planet with hard ground and dangrous volcanoes. The biggest of these volcanoes laid Pyroxx to waste. Upon exploring this Great Volcano the Wrexx tribes found the Lost Obsidian, a weapon of great power.
Considering what the Wrexx have beent through shaped them to become powerful, hardy, and strong warriors. Their survival lead the Wrexx to think they are stronger than the other Mechatars because of their ability to survive.