First and foremost, it's the towering ancient trees scattered across the Heavenly Abode.
These trees vary widely in species and size, yet they are all Spirit Wood, with exceptionally long ages. You could casually select any tree, and none would be younger than five thousand years old. Many have ages reaching tens of thousands of years.
The two ancient ginkgo trees beside the Qing Emperor Tower have ages exceeding 150,000 years, with trunks as thick as houses.
Of course, these ancient trees are merely ordinary Spirit Wood; they are neither Spiritual Medicine nor special Spirit Plants with Spiritual Intelligence. Even with older ages, the most advanced ancient ginkgo trees are only Grade Five.
But this doesn't mean they are worthless.
