Zhang Tiantu had naturally noticed the Underworld Mansion had left men stationed outside. He merely gave a cold snort and flicked his hand.
"Enter the cave!"
The Grand Commandant's Residence party dismounted one after another, following the trail of the Underworld Mansion's two envoys as they swept into the cave.
At this, the martial wanderers outside could no longer hold back either, flooding into the cave in a single surge.
Chen Jing and Sha Lifeng blended into the crowd and entered the cave amid the bustle.
The light suddenly dimmed.
The escorts at the front used tinderboxes to light their torches, illuminating the path ahead.
Layer upon layer of natural rock walls surrounded them.
Every now and then, one or two fiery-red crystal rocks embedded in the ceiling or surrounding walls flickered with pinpricks of crimson light.
"Those are Fire Crystal Rocks, naturally fire-aspected and brimming with fire energy. Castle Lord Qu really found a natural mine cave to bury his treasure in."
Sha Lifeng followed beside Chen Jing and explained in a low voice.
Chen Jing narrowed his eyes.
He thought of Thousand Mechanisms Palace's Scarlet Fire Crystals and Thunderclap Bombs.
"What is the connection between these Fire Crystal Rocks and Scarlet Fire Crystals?"
Sha Lifeng was rather surprised. He had not expected Chen Jing to know about Scarlet Fire Crystals, and he explained, "Fire Crystal Rock and Scarlet Fire Crystal come from the same source. Both are nurtured by geothermal energy. You can think of Fire Crystal Rock as crude Scarlet Fire Crystal. Scarlet Fire Crystal can only form where earthfire is abundant and fire energy gathers."
Sha Lifeng added, "Heat billows through this valley, and Fire Crystal Rock has appeared inside the cave. There is most likely lava flowing beneath us."
Chen Jing had already noticed that