Raven was shocked to hear that Khal knew about the Soul World. She could still clearly remember the way she has unlocked hers as it was through complete sheer luck and a small amount of external help.
Also, she was perfectly aware that no one except her knew about the existence of the Tenth Cultivation Stage, thus hearing that Khal had knowledge about it was rather shocking and confusing.
Khal seemed to understand Raven's thought hence just smiled and said, "What can I say? Sometimes my genius... it's almost frightening."
Raven felt her lips twitch slightly upon hearing Khal's arrogant declaration, but in the end, she just sighed and asked, "And who else knows about it?"
"Only a few from Moon Academy," Khal replied casually, his eyes continuously scanning the scenery outside.