There was already not much time left until the agreed time with Yan Xianlu. Ling Han hurried, and continued to increase his abilities in alchemy.
In cultivation, he had already reached the fourth severance peak stage, and there was no further possibility that he could improve any further.
Neither he nor the Empress had refined the Heavenly Dao Jade, but they were instead waiting for an opportunity. For example, when they were fighting with first-rate prodigies, and could directly feel the aura of a fifth severance, then if they were to refine the Heavenly Dao Jade at that moment, they perhaps might be able to succeed in one go.
Other mountain rocks could attack jade, so Ling Han lingered on alchemy. Perhaps he could gain a breakthrough in alchemy, and while he was at it, open the doors to the next stage in his cultivation.