Hundreds of years ago, an "obsidian" eruption from an undersea mineral vein caused some humans to mutate after being exposed to tidal radiation.
Characteristics: Low body temperature, extremely sharp senses, able to be active for a long time at night, and extremely long life.
Flaw: Once in continuous contact with the same human being for more than seven days, the physiological frequencies of both parties will "lock"
This will cause the power to become disordered and out of control, and even lead to hunting by higher-level similar species.
For humans, there is a risk of dependence or even loss of life.
Therefore, all Haichao people are trained into the habit of "seven days of separation".
Social structure
human
The majority of the population controls the superficial authority of the city-state.
Be wary of the Tides, but rely on their abilities in shipping, trade, and assassination.
Haichao tribe
A minority group has superior strength and longevity, but is strictly limited to special status and positions.
It is divided into three major classes internally:
Low level, limited sensory advantages, often mixed in human society
Intermediate level, mastering tide energy, employed in intelligence, routes, and force
High level, extremely rare, controls the flow of ocean tides and biological pheromones
mixed race
The descendants of humans and the Tide Tribe are unstable and have short lifespans, but they often have special abilities.
They control the city-state's most chaotic ports and black markets.
Power and sensory systems
Scent: You can smell human "scent" - a mixed sensory signature similar to blood and pheromones, unique to each person.
Locking: When in contact with the same tide for more than seven days, the circadian rhythm will be automatically bound to it, making it difficult to separate.
Intention:2