C197 Cao Zuo Who Was Furious

"Ding! You've expended 100,000 Middle-Grade Spiritual Stones, upgrading your Pill Refining function to Level 6. You are now able to concoct King Rank pills and below!"

"I can now craft King Rank pills." Su Lang nodded in satisfaction, then mused, "Currently, I only know a few King Rank pill recipes, and they're all from Tian Xiu