Heartless

Heartless were also known as Lost Hearts. The term referred to humans who had Heartless disease. It meant that humans who had contracted the disease would lose all their rationality, thoughts, and feelings, turning into creatures that were no different from beasts. All that remained were their instinct to hunt, their survival instincts, and the instinct to use simple tools.

Heartless disease, also known as the Bestial Transformation Disease or Atavism Disease. Until today, people still haven’t grasped its pathology and spreading patterns.

Due to a living environment made it very rare for Heartless to live past the age of 30. However, they had the instinct to reproduce and had a large number of descendants. Meanwhile, the Heartless from subsequent generations had a little more intelligence and were equipped with better hunting abilities. Their instinct became stronger with every generation of Heartless. Furthermore, the Heartless had the intrinsic qualities of humans. They could suffer corruption and mutate. This resulted in the painful deaths of a large number of Heartless, as well as the creation of a group of top hunters.

Awakened Heartless are called Superior Heartless.