Arcanum Threat Classification {ATC} System

ATC-Alpha (Safe)

Description: Entries that are well-understood and pose little to no direct danger to their surroundings or handlers.

Containment: Easy to contain or may not require stringent containment procedures.

Example Usage: An ancient tome that whispers secrets but is otherwise inert unless read.

ATC-Beta (Euclid)

Description: Entries with unpredictable behaviours or properties. Their threat level can vary, and they require more resources to contain safely.

Containment: Containment procedures are more complex, often requiring regular observation and adjustment.

Example Usage: A mirror that shows possible futures but sometimes traps viewers in a trance-like state.

ATC-Gamma (Keter)

Description: Highly dangerous entries that pose a serious threat to the stability of the world, reality, or the fabric of space-time. Often difficult to contain.

Containment: Requires extensive and often complex containment procedures. May need constant surveillance and intervention.

Example Usage: A portal that intermittently opens to a malevolent dimension, releasing hostile entities.

ATC-Delta (Thaumiel)

Description: Entries that are used by The Order or allied organisations to contain or counteract other anomalies. These are often well-controlled or understood and provide strategic advantages.

Containment: Typically self-containing or beneficial in nature, but still monitored due to their potential impact.

Example Usage: An amulet that can neutralise extradimensional energies, essential in containing or mitigating other high-threat anomalies.

ATC-Omega (Apollyon)

Description: Entries that are essentially uncontainable and pose an existential threat to the world or reality itself. Their existence is often a closely guarded secret.

Containment: Containment is often not possible. The focus may be on mitigation, delay, or preparation for worst-case scenarios.

Example Usage: A cosmic entity that is slowly consuming the fabric of the universe, its presence barely kept at bay by immense and continuous efforts.

ATC-Zeta (Archon)

Description: Anomalies that have a profound and usually positive impact on humanity or reality. They might be integral to the existence or stability of the world.

Containment: Not contained due to their beneficial nature, but are closely monitored and studied.

Example Usage: A sentient library that holds the knowledge of all civilizations, continuously expanding and providing insight into solving other anomalies.