God Tier power was absolutely a splendid tonic, only slightly inferior to God Tier medicine.
Before, Ling Han ate the root of that God Tier medicine and improved his physique by whole lot, even almost forming Rock Cliff Body; however, his cultivation barely improved. This was because a true treasure would only increase the foundation just like the best steel should be used on a knife's edge—it wouldn't be wasted on increasing cultivation.
After establishing a firm foundation, would he need to worry about not increasing cultivation fast enough?
However, this surge of power also increased his cultivation quickly as well. This meant that a part of the power was actually "wasted." Of course, Ling Han needed to reach the higher tiers, so he naturally wouldn't mind.
Moreover, he got the Demonic Qi for free, how could he be picky?