For an Alchemy Master, having such a top-grade Pill Furnace and not using it would be a tremendous waste.
He cast a Master Recognition Technique on the Top-grade Fourth-grade Pill Furnace, successfully acknowledging it as master, with no issues arising during the recognition process.
'Green Mist Treasure Cauldron', this is the name of the top-grade Fourth-grade Pill Furnace.
Since the 'Green Mist Treasure Cauldron' had never been used before, he needed to start by refining a large number of Nascent Soul Early Stage Fourth Grade Elixirs, to nurture the 'Green Mist Treasure Cauldron', enhancing its spiritual connection with spiritual medicine before he could proceed to refine Great Cultivator Spirit Pills.
The newer the Pill Furnace, the better—quite the opposite. It turns out the pill furnaces used over time have absorbed ample spiritual medicine essence, reducing the likelihood of accidents during alchemy.
