Jing Yan, transitioning from the Immortal Rhythm to the Immortal Venerable, like other cultivators, had to cross that seemingly insurmountable barrier.
In the Chaos World, he was at the Title Controller level, equivalent to the Immortal Rhythm Nether Sky Realm in the Immortal Domain. Although he lacked experience with the Immortal Venerable Realm, he devised a Virtualization Technique at the Immortal Rhythm level, giving him a direction toward nearing the Immortal Venerable. Yet even so, the journey remained arduous, requiring slow and careful exploration.
With the previous progress, stepping into the Immortal Venerable Realm indeed required a long time for Jing Yan.
But now, after mastering the Shadow Soul Kill, that barrier between Immortal Rhythm and Immortal Venerable loosened significantly, thinning the fog before Jing Yan.
"Next, it's time to cultivate each of these ten plus Immortal Rhythm and Immortal Venerable level spells."
