Yang Jing didn't stay in his Cave Mansion. Instead, he carved out a new cave in the mountainside.
After gaining the Talent of Mastering the Five Thunders, any change in the surrounding weather or Spiritual Mechanism would resonate with the Magical Power in his body.
When the sun rose and the sky cleared, his Fire Element Magical Power would become active, causing his heart-fire to rise. During continuous rain, his Water Element Magical Power would become active, and his kidney-water would overflow. If the weather changed drastically and he didn't suppress his Magical Power in time, it could even generate a bolt of thunder, destroying the furniture around him.
Yang Jing had been forced to move into the cave only after he accidentally unleashed a bolt of True Thunder in his sleep, shattering his bed.
However, it was a blessing in disguise. By using his Mastery of the Five Thunders, his comprehension of the Celestial Intent Four Extremes Sword Intent deepened.
