The Spirit Realm within the Dragon Head Bone came from Xiaoyu's mother and was surely bigger than this under normal circumstances.
It had only shrunk in size to reduce loss due to the lack of energy supply and the desire to sustain it long-term.
Now that they had found a "Dragon Horn," the Spirit Realm instinctively began to expand and restore itself.
However, the Dragon Head Bone was still just a remnant and couldn't possibly bear the strain; if left unchecked, it would certainly burst.
This was all that was left of his mother's thoughts; Xiaoyu had lived and grown up inside it, and she was now panic-stricken, quickly calling on the power of the Neutron Spirit Star to suppress it…
But she had just broken through, and her control over her power was still clumsy.
Also, the expansion of the Spirit Realm was from the inside out, like a balloon being inflated, and it could burst at any moment if not handled carefully.
