The Dragon Crocodile Beasts are fond of eating human flesh. Besides that, they are attracted to items with a moist aura, as can be seen from their continued existence in the Swamp Land.
The black crystal stones Wuche took out are 'Dark Mist Crystals.'
For cultivators, Dark Mist Crystals have no use, unlike Spirit Crystals or Star Crystals. However, for the Dragon Crocodile Beasts, they are one of their favorite foods.
Dark Mist Crystals remain buried underground for years, condensed from a damp aura, much like how spiritual energy condenses into Spirit Crystals.
However, since Dark Mist Crystals are useless for cultivators, they are not rare and can be found in many places.
The Mercenary Group of the Heavenly Sea prepared Dark Mist Crystals solely to lure out the Dragon Crocodile Beasts.
