The Great Spirit heaven's floating island was the heavenly Lord of Justice's main base. In fact, there were other bases of the heavenly Lord of justice on other planets in the eight desolate universe. Basically, there were hundreds of such bases in every galaxy.
This was the authority that Chu wuxia had obtained from the Empress when she had followed Ji Shuanghua to promote the restructuring of the academies and helped and supported the immortal Taxation Division in settling the accounts. In other words, the heavenly Lord of justice would station troops on about a hundred planets in each Galaxy.
On one hand, it was good for training the heavenly Army of justice. On the other hand, it was convenient for Immortals to join the heavenly Lord of justice. On the other hand, it could work with the star God or The Guardian envoy to suppress the immortals on the planet or universe.