The undead nature of Crawlers naturally attracted the attention of Wizards.
Years ago, many Wizard Organizations specialized in capturing Crawlers for dissection and behavioral studies.
But in the end, nothing was discovered, and the reason for their immortality remains unknown.
Based on conventional theories in the Wizard World, it's speculated that Crawlers' immortality stems from pollution, characteristics originating from certain existences in the Abyss Plane.
Crawlers are humans that were polluted after death, causing their corpses to acquire some unknown traits, enabling them not to die.
However, this immortality is not truly immortal.
Researchers believed Crawlers don't die because their power comes from some distant existence in the Abyss Plane.
As long as that existence lives, these Crawlers can continue to be undying.
After many studies yielded no concrete conclusions, gradually, no one conducted research on Crawlers anymore.
