Those who could refine Immortal Realm medicinal pills were Immortal Alchemists.
Mu Wan'er, for example, was an Immortal Alchemist.
Above Immortal Pills were Divine Pills, if she wanted to reach the Divine Alchemist Realm, she had to improve on alchemy and have sufficient spiritual qi and immortal qi as the foundation, otherwise it would be impossible.
Which meant…
Mu Wan'er had to reach the God Realm above the Heaven Immortal Realm before she could successfully step into the realm of Divine Alchemist.
She stepped inside and saw the scene in the palace.
Even though it did not look particularly luxurious, the furnishings and the materials used to build it were all extremely beneficial to alchemy.
Which meant…
This pill furnace palace which did not have much room was one huge pill furnace.
The shape of the pill furnace had the same effect as this huge palace.