The Immortal Core is the foundation of every cultivator.
To use various Immortal Techniques, one must mobilize the Spiritual Energy within the Immortal Core.
It could be said that the Immortal Core is equivalent to a source of Spiritual Energy within the cultivator's body.
Below the Immortal Emperor Stage, after the cultivators condensed the Immortal Core in their bodies, it was a constant process of refining the Immortal Core and enhancing it.
The size of the Immortal Core within the Dantian of an Initial Stage Profound Immortal cultivator is probably only a third of Shen Feng's, and most importantly, he now has two Ten-Colored Immortal Cores in his Dantian!
If he temporarily could not understand why a second Immortal Core had formed, then Shen Feng simply put the matter out of his mind.
At this moment,
his aura within his body was at the peak of the Initial Stage of the Profound Immortal, just one step away from entering the Middle Stage of the Profound Immortal.
