Lee Chanhyuk

1. Overview
Since ancient times, humanity has coexisted with Gates.
In prehistoric eras, the radiant Cores of Gate Beasts were revered as sacred objects.
Today, they power our civilization.
Individuals once called shamans or hunters are now known as Hunters, and they continue to confront the threats beyond the Gates.

2. Gate
A Gate is an interdimensional rift that leads to a warped reality filled with Entities.
Each Gate houses a Gate Core, a pulsating crimson-violet crystal that generates these Entities.
When the Core is destroyed, the Gate collapses.
If not contained, Gates erupt in a Crack, releasing Entities into the world.

3. Core
Cores are the crystalline hearts of Entities and a major energy source for modern society.
Their colors range from green to crimson-violet, representing Core Purity.
Only Hunters can feel the pressure of high-purity Cores through Core Units (CU).

4. Entities (Gate Beasts)
Entities are creatures born from Gates — twisted versions of animals, plants, or minerals.
Their forms are grotesque, often nightmarish, and range in size from small beasts to leviathan-level threats.

5. Gate Classification & Threat Level
Gate Tiers are based on the Hunter Rank required to neutralize them solo.
The higher the Gate Tier, the greater the threat it poses.

Gate Tier Hunter Rank CU Threat Scope
Tier F Rank F 4 CU Small facility
Tier E Rank E 8 CU Village
Tier D Rank D 16 CU Urban district
Tier C Rank C 32 CU City zone
Tier B Rank B 64 CU Metropolis
Tier A Rank A 128 CU Nation-wide threat
Tier S Rank S 256 CU Continental crisis
Tier SS Rank SS 512 CU Global disaster
Tier SSS Rank SSS ??? CU Extinction event

6. Hunter
Hunters are individuals born with or awakened to the ability to sense and control Core Units (CU).
Each Hunter possesses a unique ability and is resistant to the CU pressure that normal humans cannot feel.

7. Hunter Rank & CU Measurement
A Hunter's rank is determined by how much CU they can emit and withstand.
The system reflects the strongest Gate Tier they can clear solo.

Hunter Rank Core Units (CU) Solo Gate Tier
Rank F 4 CU Tier F
Rank E 8 CU Tier E
Rank D 16 CU Tier D
Rank C 32 CU Tier C
Rank B 64 CU Tier B
Rank A 128 CU Tier A
Rank S 256 CU Tier S
Rank SS 512 CU Tier SS
Rank SSS ??? CU Tier SSS