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If there's anything that could severely threaten any soul forms brought back by evil hands aside from Light Laws, it would definitely be Lightning Laws.
Unbeknownst to many, the Ghost Race exists. They are a terrifying bunch of beings, capable of directly attacking one's soul. Just by a mere touch, they could claim lives like it was nothing. They are inherently dangerous but their existence is solely subjugated by the Heavenly Laws - nature, per se.
And like any other races, they too are capable of strengthening themselves. They developed a unique way of cultivation that, only their race could use. There were even a time when the Ghost race was once arrogant and one to unify all under their banner.
