The words of warning from Wang Yutian were not ignored by Wei Wuyin. He had already studied World Realms and Secret Realms long ago when he had first learned about them. He had even asked Wu Yu regarding their innate protections and the typical result of their destruction. According to him, it was similar to a Starlord, a cultivator at the peak of the Astral Core Realm, the Star Core Realm, was to detonate themselves in a violent fashion.
While Realm World Phase experts, those at the Seventh Stage of the Astral Core Realm can create World Realms and Secret Realms, they still required an enormous amount of time and resources to build an artificial core that held a sufficient amount of energies and power to sustain the realm. No matter what, even the weakest of World Realms, would be as if a Starlord self-destructed their Star Core.
It should not be underestimated.