Darkness Core is a shared engine library with its own shader/impact frame editor, multiverse creator and, 3D planet/space rendering system.

Multiverse — custom dimensions on a grid

A complete alternate-world system. Each "Earth" is a fixed slab of terrain living on a spiral grid inside one shared dimension, sealed off by wrap borders so players stay on their island.

Create unlimited named worlds ("Earths"), each with its own terrain type, border size, gravity, biomes, and seed
Terrain types: normal, dry, water, and space (pure void — for orbital builds and space stations; you fall forever instead of dying)
Per-world gravity scaling
Safe teleporting, per-world spawns, and an auto-transfer option for the base world
A public API so other mods can register and jump between worlds in code

Jade — in-world planets & sky

Real 3D planets you can see hanging in the sky and fly out to.

Textured sphere or cube planets placed at world coordinates, with real-time axial spin
Atmosphere glow — a soft Veil-style luminous rim around each planet
Orbital rings (tilted, textured) around planets
Approach & visibility distances so planets read as far away, then grow as you fly closer
Fly into a planet to teleport down to its surface world
Per-Earth skies: custom cubemap skyboxes, custom sun & moon, fog colour/distance, and rings arcing across the sky — all per world
In-game planet editor (color wheel, live sliders, save/load) — everything is data-driven JSON, so packs and addons can ship their own planets and skies

Dark's FX Engine — real time shader/impact frame editor

A stack of screen effects: zoom blur, black & white, red tint, radial blur, chromatic aberration, vignette, bloom, edge/outline, speed lines, halftone, scanlines, screen shake, and more
Named presets you build in-game and play by name
Sequenced playback — chain effects with timing for impact frames and cutscene-style hits
Multi-panel compositor for splitting the screen into comic panels
In-game shade

For modpacks & mod developers

Data-driven: planets and skies are JSON under data/<namespace>/jade/planet/ and .../jade/sky/. Ship your own — no code required.
Dormant by default: with no planet/sky data present, none of the space visuals appear. The engine simply idles. Great as a pure dependency.
API: register and teleport between worlds, drive the FX engine, and hook the planet system from your own mod.
Addons ship their own content under their own namespace — Darkness Core is the engine, your mod is the content.