Back then, the Taiyin laurel tree had told Jiang Chen that if he wanted the Sun's Divine Stick to evolve into a top-tier Innate Spiritual Treasure, it must undergo the baptism of the Thunder Marsh.
Jiang Chen remembered this statement and had been secretly seeking the whereabouts of the Thunder Marsh ever since. However, since the great battle between saints at the end of the ancient times, the Thunder Marsh completely disappeared without leaving any clues.
Not to mention Jiang Chen, even the Great Divine Transcendents couldn't find the whereabouts of the Thunder Marsh. Yet, Jiang Chen didn't expect that he would eventually locate the Thunder Marsh in this way.
"Indeed, serving the Heavenly Dao benefits one unavoidably." A thought stirred, and Jiang Chen realized the reason for this.
The Heavenly Dao knew that Jiang Chen was searching for the Thunder Marsh, therefore, it gave him the fragment of the Prehistoric Thunderbolt Treasure Tree.