In the deep, dark underground, no matter what world it was in, it was synonymous with "mystery" to Surface World creatures.
Better than obstructed vision and the psychological pressure brought by unknown darkness, the vast majority of creatures accustomed to the Surface World environment were extremely resistant to venturing underground.
This mentality even included the two fearless female knights and Mother Tyrannosaurus.
Saine was different. He had spent his apprenticeship in the dark and gloomy Underground World.
Even later, while studying magic at Azure Source Holy Tower, Saine had preferred quiet, dim research environments. Perhaps it was influenced by the atmosphere he had grown accustomed to during his apprenticeship.
While the vast majority of Wizard World Surface World creatures felt an inexplicable aversion and resistance toward the dim, oppressive underground environment,
Saine instead possessed an inexplicable affinity and adaptability toward the Underground World.
Surrounded by darkness, Saine instead felt an inexplicable sense of peace.
Perhaps only people like Saine, who had once merged into darkness and adapted to darkness, could truly move through dark environments like fish in water.
The speed at which the Level-3 Golo Earthworm fled through the earth could not be called slow.
Even with Saine's Mental Strength, after tracking it for just over ten minutes, he completely lost his sense of it within the intricate Underground Space.
It was worth mentioning that when Saine and the others had first descended from the Surface World, there had indeed been only one passage in front of them—the one bored out by the Level-3 Golo Earthworm.
But ten minutes later, after they had descended roughly several thousand meters underground, countless jet-black openings and terrain resembling stalactite caves appeared in Saine and the others' field of vision.
Indeed, no matter what plane it was, Underground Worlds shared certain things in