For Dalvin, his current Internal Breath value was 1,040 since he was 4% through the Second Rank. It seemed for the Dark Void Immortal Art, every 10 points of Internal Breath made 1% of progress through the realm, meaning that one needed 1,000 points of Internal Breath to complete a sub-realm.
Simple enough.
He poured out all of his Neiqi pills and absorbed them, leaving the system panel open so he could see his soaring cultivation rank and prowess. He cleared the few bottles that Feng Qi had left for him and rose to the Houtian Fourth Rank with ease.
After that, he used devouring to swallow up Nieqi pills bought from the system shop using spirit stones paid for by players, deposited to him and then changed from his right hand to his left hand.
So basically, for free.