The Eight-Headed Hydra Demon Serpent (2)

Cultivators with Earth affinity are mostly those who, if they manage to take their elemental mastery to the next level, become the most annoying and terrifying opponents one could face. 

After mastering their element to a certain stage, Earth elemental cultivators can transmute their earth element into metal. 

Of course, that is only if they manage to awaken their element. 

But there are a few, like the Zhou Twins, who managed to transmute first before they awakened it. Currently, they are a force to be reckoned with in the academy. 

Their defence and offence are very powerful simply because everything has transformed into metal. So when Klaus saw the brown horn glow and, as an Elemental Overlord, immediately sensed the danger, he retreated.