Halcyon | Data & Essence

The mod centers on a heart magitech factory and a set of machines, some familiar and some new, that handle production and the movement of materials around a factory. Logistics tools let players carry spoils from one part of the factory to another. New structures hold knowledge sealed away from the player until it is uncovered.

Exploration is driven by world-traversal items, including a grappling hook, and by several tools and creations of artifice. The story is told through discoveries, experiments and the once-forgotten magitech machinery of its architects, and the world's history is revealed as the player explores it. Multiple sets of thematic building blocks, including obsidian and copper variants, support construction.

Halcyon | Data & Essence requires Databank, and EMI is optional for item and recipe viewing. Both the server and every player need the mod, since the environment is client and server. Files target NeoForge for 1.21 – 1.21.1, with 0.4.3+aria-of-the-moon for 1.21.1 as the latest alpha build. The license is custom and the mod is not open source, though public links to source code and an issue tracker exist.