The Divine Thunder Source had been gifted by the Night Clan back in the Hundred Thousand Mines.
But tracing it to its roots, it had come from the Immortal Tomb tied to Su Shi'er's Senior Sister Shen Miaoyin's former identity as an Immortal.
Even in the Cultivation World, with nearly all its power drained away, it was still a supreme treasure of terrifying existence.
If a treasure like this could be completely refined by the thunder spirit, the boost to the thunder spirit's strength would undoubtedly be terrifying.
However, the thunder spirit cultivated by absorbing lightning power. The Divine Thunder Source itself also had the effect of absorbing lightning power.
After the thunder spirit swallowed the Divine Thunder Source, its cultivation and strength increased, while the Divine Thunder Source itself grew stronger by the day as well.
It had never been easy for the thunder spirit to completely refine the Divine Thunder Source.
By now, reaching eighty percent refinement was already quite impressive.
As for what kind of improvements and changes complete refinement would bring to the thunder spirit, even Su Shi'er could not imagine it.
But one thing was certain: the benefits would be immense.
"All right, return to the Small World and continue cultivating first."
Smiling and nodding, Su Shi'er put the thunder spirit away again.
As for these eighteen thunder orbs, how should they be used if they contain traces of the Heaven and Earth Furnace's power?
The thunder spirit dares not devour them. If I directly try refining them with Lightning Law, would there be risks for me as well?
Yet these treasures are clearly connected to the Heaven and Earth Furnace. If I truly trade them to someone else, I fear...
Should I try refining one?
*The Heaven and Earth Furnace's power is like arsenic