The six of them were the first to seclude themselves for cultivation, already deep into their breakthroughs. If nothing unexpected happened, all six should be able to advance to the next level.
Compared to starting cultivation, breaking through to become an Immortal is far more difficult; it's the hardest step of all.
One must first reach the Peak of Great Achievement Stage, then shed the Mortal Body, or rather, transform the Mortal Body into an Immortal Body and ascend as an Immortal. However, the most challenging aspect is not this but talent and comprehension.
Firstly, one must possess high talent and comprehension to touch the threshold of the Immortal Path during a breakthrough, to seek one's own Immortal Path, and then integrate with the Immortal Path. With countless paths in the grand Dao, there should always be one that belongs to oneself.