Codex: An Introduction to Legarune Galaxy

1. Scope of the Universe

Legarune spans a single galaxy, with interstellar travel considered theoretical but achievable. The galaxy is vast, layered, and ancient, containing both active and long-abandoned civilisations. While real-world physics is strictly followed, there is allowance for rare anomalies and undiscovered phenomena, ensuring the setting remains scientifically grounded yet capable of unexpected occurrences.

Time is treated carefully: relativistic effects, light-lag, and gravitational distortion shape how history and events are experienced across light years. Civilisations experience time differently, which complicates communication, coordination, and historical record-keeping.

2. Timeline and History

The setting spans thousands of years, allowing for gradual technological acceleration, especially AI-driven evolution. Civilisations have repeatedly:

• Risen to dominance

• Expanded across stellar regions

• Collapsed due to mismanagement, war, or natural catastrophe

• Reformed, sometimes in entirely different forms

Progress is non-linear, and there is no static golden age. Humanity’s timeline is anchored around a major event known as the Emergence, which divides history into Before Emergence (BE) and After Emergence (AE). By 1500 AE, humanity has:

• Unified politically on Earth

• Stabilised post-scarcity economics

• Expanded into the galaxy using corridor networks

• Gained unprecedented technological capability via AI and AGI

This history emphasizes adaptation over inherent supremacy, making humanity notable for agility and innovation rather than natural dominance.

3. Physics and Technology

Legarune adheres to realistic physics, including relativistic travel, energy constraints, and conservation laws. “Faster-than-light” travel exists only via precursor-built corridor networks, not human engines. Technology appears magical but is:

• Inherited from AI-guided discoveries

• Partially understood, requiring constant study

• Dangerously powerful, with misuse causing neurological or structural collapse

Cybernetic augmentation and optional mind-uploading exist but are restricted and regulated. Overuse or mismanagement can lead to systemic failures.

Key principle: Technology enables humans to evolve rapidly. AI and AGI do not just assist—they amplify human cognition, accelerating the understanding of physics, biology, and engineering, enabling space exploration at a pace far beyond natural evolution.

Legarune is:

• A galaxy shaped by advanced technology, intelligence, and strategic control, not heroism or mysticism

• Cold, analytical, and tense but stable

• Focused on intelligence outpacing wisdom

• About civilisation inheriting power it did not earn

• About survival, exploration, and adaptation in a vast, AI-accelerated galaxy