It had to be said: after the World-Ending Thunder Dragon agreed to follow Ling Tian, the benefits to him were immense. Not only had he gained another Saint-grade Heavenly Treasure, it was one of a kind throughout the entire world. Most importantly, the World-Ending Thunder Dragon possessed extremely powerful combat strength. After absorbing all the Lightning Power in Thunder Purgatory, it could easily kill experts at the Twenty-third Heaven of Near-Saint.
Experts at the Twenty-third Heaven of Near-Saint were a difficult challenge for Ling Tian right now. The World-Ending Thunder Dragon's ability to deal with cultivators of that level would undoubtedly make their next moves much safer, and make it easier for them to obtain other Saint-grade Heavenly Treasures.
On top of that, the World-Ending Thunder Dragon's addition brought other benefits to Ling Tian and the others. For example, it surely knew what the other one-of-a-kind Heavenly Treasure in the entire world was, and might even know where it was. That would undoubtedly make it easier for Ling Tian to obtain it. From their earlier conversation, Ling Tian could confirm that the World-Ending Thunder Dragon knew the identity of the other one-of-a-kind Saint-grade Heavenly Treasure, and there was a good chance it knew where to find it.
However, Ling Tian didn't ask the World-Ending Thunder Dragon about any of that just then, because it was busy absorbing the Lightning Power here. For now, that was more important to it—and to Ling Tian. Once it absorbed all the Lightning Power here, they could leave and move on to their next step.
Ling Tian knew the World-Ending Thunder Dragon's actions would surely cause a huge disturbance in Thunder Purgatory and draw in a flood of Outer Realm Cultivators, but he wasn't worried. In just ten or so years, there shouldn't be many