As for the fact that the Fountain of Immortality has a core, it has actually been proved through the spell-casting operation just now.
After all, if the real core is easy to take away, then how can it be impossible to use more powerful means?
This is like lifting something that can be lifted with one hand, but it cannot be lifted by a crane, which is too ridiculous.
Then it can only be explained that the core was touched in the process of casting the spell.
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