Inside the secret chamber, Spiritual Light gleamed.
A dark yellow radiance silently seeped into the walls. The bluish-gray soil seemed to have been scorched by temperatures of several thousand degrees in an instant, shrinking and solidifying into something incomparably hard.
Wang Chen withdrew his palm after casting an Earth Stone Technique.
At the Great Accomplishment level, the Earth Stone Technique could penetrate a two-chi-thick layer of soil, and the resulting stone was harder than refined iron.
That was precisely why Wang Chen had raised this spell to the Great Accomplishment level before beginning to excavate the bunker.
What he wanted was far more than a place to shelter underground.
This bunker had to withstand spell attacks such as the Earth Shaking Technique, while also blocking the intrusion and corrosion of earth qi. A low-level Earth Stone Technique simply could not meet those design requirements.
Looking around, Wang Chen felt quite satisfied with the newly completed underground safe room.
The secret chamber covered roughly twenty square meters, more than enough for either cultivation or rest.
It was located thirty meters beneath the ground, and for now, it was still nothing but a bare shell.
Only an Obsidian Lamp hung on the wall to provide illumination.
The Obsidian Lamp was one of the most commonly used lamps in the Cultivation World. The White Radiant Stone embedded in its lamp head shared the same origin as the Radiant Pillars in the guard station. As long as it soaked up the sun for a few hours during the day, it could provide light for an entire night.
The previous owner had been poor as a church mouse and could not afford an eco-friendly, pollution-free Obsidian Lamp.
He had used the cheapest grease oil lamp instead.
A grease oil lamp was passable in a room