Light Spirit simply answered.
"If it was during the time I first arrived, then it would be a problem indeed. But fortunately, I have recovered a bit of my power, so moving the Tribulation Lightning Source to the same place that you keep your soul shouldn't be anything difficult to do now. If anything, it should become easier for you to use it."
Krune nodded and didn't ask anymore.
Feifei selected a random position far from the other wisps and immediately took a lot of spirit stones out. She then started to absorb and condense it until she couldn't go any further and smashed the Core with it. Still, the Core is something very resistant, so just one or two attacks will be far from enough to crack it open.
That is also the reason why you need a lot of spirit stones during this process. Every attack uses a lot of energy, which had to be replaced right after. Otherwise, the Core would recover from the previous attack, and the process would have to start again.