Born with a "body with no pulses" and unable to store spiritual energy, it is actually an "ethereal body" that is rare throughout the ages (requires special skills to activate)
The family was destroyed by the enemy, fell off a cliff while escaping, and strayed into the root world at the bottom of the Lingshu tree.
A bronze stele engraved with strange runes was found at the root of the sacred tree, which recorded the long-lost "Lingshu Stealing the Sky"...
