The key still lies in the quality of the Spiritual Energy, not only is it of high quality, comparable to the Cultivation Cave Mansion of a Third Tier Spirit Vein.
But more importantly!
These old cultivators were desperately breathing in and out, taking out various Spiritual Artifacts and even Spiritual Treasures to conduct detection.
They arrived at an unbelievable conclusion.
The Spiritual Energy in this secret realm... hasn't been contaminated by Evil Qi!
However, how is this possible!
You must know, as high-ranking individuals in the Immortal Cultivation World, even if their cultivation is low, they are still the ones closest to the core circle.
They had already known for a long time that the Earth Veins of the entire Immortal Cultivation World had been more or less polluted by Evil Qi.
When the Earth Veins are polluted, the Spirit Veins naturally also become problematic, and there's simply no way to resolve it.
