The Heavenly Spirit Material required to refine the Birthless Killing Sword, besides the Sky Slaughter Stone, included another kind of Heavenly Spirit Material called the Extinction Demon Jade.
The Sky Slaughter Stone and the Extinction Demon Jade were not ordinary Heavenly Spirit Materials, as both inherently possessed killing and demonic properties.
Cultivators exposed to these two materials would be eroded by killing intent and demonic energy, and no one below the Divinity Transformation Stage could escape unscathed.
Both would lead to one losing their nature, the former turning into a mass murderer while the latter becoming a deranged demon.
Even if a Low-Order Cultivator had the good fortune to come across these two Heavenly Spirit Materials...
This was not fortuitous but a calamity.
Cultivators in the Divinity Transformation and Lianxu Stages had strong Divine Souls, and their resistance to 'contamination' was much more formidable.
