"Some Martial Artists even tried to cultivate directly using Source Crystals, which greatly accelerated their progress."
"But humanity soon discovered that besides emitting source energy, Source Crystals also contained a special substance that was impossible to purify or filter—a deadly poison to humans."
"In mild cases, prolonged exposure to a Source Crystal's radiation would cause one's genetic chain to collapse and lead to malignant mutations. In severe cases, cellular tissue would necrotize and dissolve into a pool of pus."
"That's why, in the early days of the Earth Federation, a cleanup campaign lasting over a decade was launched. All large, discovered Source Crystal Veins on the surface were sealed off, cleared out, and neutralized."
