The group of the three - Xue Yu, Kuzan and Peler - went to the Lightning Tower without disturbing anyone. Everyone was strengthening up themselves either by sinking in lightning blood or refining the weapons.
And once one immerse oneself in such training, then other than being awakened by Xue Ren himself, everything else is pretty much disappointing. Xue Yu added as she was the first one to arrive in front of the 'lightning world's core'.
As the core had spent a lot of time in the hidden world of the dragon, the core had yet to properly focus on the lightning that everyone practices. Still, it has good effects, mostly on the blood pools from the victims of Yumma, so everyone was not in hurry.
Xue Ren himself just allowed it to slowly assimilate with his islands.
But with the knowledge, the time has come to properly awaken the clone!