"Huh, there's actually a hint of Thunder Fire Stone up ahead?"
Continuously burrowing underground, Long Yan and the Rat King moved at similar speeds.
Suddenly, Long Yan sensed a strong aura up ahead, which was the aura of Thunder Fire.
The Nine Dragons Battle Heaven Seal he was cultivating had only absorbed the power of the Earth Fire Stone. If he could obtain enough Thunder Fire Stone, he could cultivate the Nine Dragons Battle Heaven Seal to the second layer, the power of which could rival a Profound High-grade Combat Skill.
The closer he got to the front, the stronger the aura of Thunder Fire became. Long Yan was very certain that there were Thunder Fire Stones up ahead.
"There's actually a Thunderfire Vein here."
About half an hour later, Long Yan found a complete Thunderfire Vein up ahead, which contained a massive amount of Thunder Fire Stones.
