"Sir, do you really wish to perform the blood exchange yourself?" Hearing Li Chen say this, the shop assistant assumed he was reluctant to pay the extra fee and hurriedly said, "We have a special offer for valued customers such as yourself. It costs only eight thousand..."
Li Chen said, "Say no more. Just give me the spirit blood."
After a pause, he added, "Also, I want to buy a hundred thousand worth of raw mercury."
Raw mercury was the raw material used to refine spirit mercury, as well as the core spirit material of the industries associated with the Blood-Exchange Art. He had bought some before, but had long since used it up in the Demon Domain's Bitterwind Wasteland.
With this material and the corresponding refining method in hand, he could refine it himself to meet his own needs whenever he had time in the future.
The shop assistant froze for a moment before responding, "Very well. Please wait a moment. I'll fetch the proprietor."
Before long, the proprietor personally brought over the spirit blood and raw mercury. Li Chen briefly inspected them, paid for the goods, and hurried away.
Li Chen returned to his lodgings, shut the doors and windows, and immediately sat cross-legged to circulate his power. Using specially made tools, he began injecting the spirit blood into himself, drop by drop.
Watching the silvery liquid, which resembled mercury slurry, slowly flow down the flexible tube, Li Chen grew thoughtful as an icy sensation spread through him.
This craft is actually similar to most modification methods. It isn't difficult for an ordinary rogue cultivator to learn the basics. The difficulty lies in scaling it up and running an industry.
*At my current level, refining spirit mercury suitable for use in the human body would still take considerable