Simultaneously in three worlds, practicing the Celestial Demon Technique!
The difficulty in this is indeed very high.
After all, three different worlds mean having to pay attention to three avatars at the same time, requiring even greater mental effort.
Plus, the Celestial Demon Technique itself is targeted by various world consciousnesses; any slip could lead to total failure.
In such a situation, most people who practice the Celestial Demon Technique choose to do it one world at a time.
Moreover, entering other worlds with the Celestial Demon Technique means starting over, which is undoubtedly the hardest thing for anyone practicing it.
Even those with powerful cultivation find it very difficult.
However, such difficulties aren't too much of a concern for Lu Sheng.
"I have the system panel; even if I need to change to different cultivation systems, it doesn't make much difference to me."