The flame beast king's demonic core shared the properties of the earthcore fire. After all, it was a life form that had come into being from the power of fire the earthcore fire was emanating. Because of that, its demonic core allowed one to approach the earthcore fire unharmed.

If one approached rashly without the demonic core, one might be a victim of the earthcore fire’s attack. After spending a millennia to form, the millennium earthcore fire possessed a certain degree of intelligence. One could say that it now possessed some sort of consciousness. Thus, if one wanted to obtain it, one had to first obtain its approval.

Other than that, the only way to get it would be to rely on the brute strength of an expert. But since these people here were all Transformation...