"The spirit pool is the 'spring' born within the quasi-third grade Holy Stone Mine. Every half a year, it fills up with Heaven and Earth Spiritual Qi... If you can cultivate inside, it's a chance to achieve twice the result with half the effort! Of course, the spirit pool generally has great benefits for martial artists and Taoist cultivators below the Great Saint Realm. For those above the Great Saint Realm, however, entering it offers no improvement, which is why in our Xuan Kong Mansion, the spirit pool usually doesn't accommodate those above the Great Saint Realm."
Matthew King patiently explained.