Horford had the ability to enter and exit the halsai Palace freely. Hence, he didn't go with Xu Nan.
According to yesterday's plan, he would go to the hall of dusk alone and try to steal the mending book. In any case, there would be many alchemists coming and going in the twilight Hall today to listen to this debate. Even if they really lost the closed book, they wouldn't suspect that the artifact leader was a mole for a while.
Xu Nan walked along the corridor at the side of the three leaves Great Hall, aimlessly strolling.
The halsai Palace was just too big.
After the seal was lifted, stefnsan did not have enough manpower to check and monitor every corner, which gave the soul stealers a lot of space to move.