At the outset of the battle in the Frontier Wilderness, An Lan believed the key had been left in a certain corner of the Sin Continent.
So he took action by force, intending to take Sin Continent and bring it back to slowly search for the whereabouts of the key.
However, at the last moment, Jiang Hui chose to intervene, thwarting the other's intentions.
As such, Fire Spirit was not captured.
Naturally, there would be no talk of being eroded by darkness.
It wasn't that Jiang Hui had a heart of pure goodness.
But if he could facilitate a good deed, there was no reason not to, especially considering the future Emperor Huang Tian, who would be poured over with blood and tears by the Ten Thousand Clans.
After all, if it weren't for Emperor Huang Tian suppressing the trend of dark encroachment in the forefront and severing the epochs with a single sword, there probably would not be the so-called Earth of later generations.