
Halcyon
-what is this song that drives me?-
To beget change, one must consider first the nature of its recipient. This is easily done: evidence of a scarred past is all around, clinging to the world like detritus in water that needs but a single motion to stir to the surface. A tablet rests high in snow-capped dark cradled by a feathered hand. The past is opening itself to you. It just takes one step, one fleeting motion to behold. Will you do it?
The road onto which you will embark stretches high and low, twisting through other realms alien and familiar. The ascent will be vast, but so too will be its spoils. The further you go, the more you must bear in mind your goal. To beget change, one must ultimately embody its agent.
This is Halcyon, a story of reconciliation told through your discoveries and experiments surrounding once-forgotten magitech machinery and its architects. Through artifice, grow familiar with the ebbs and flows of the Tides. Unearth a lost history, and realize it was not lost at all. Explore, construct, make contact, learn. And at the end of all things, when the lights in the sky are dim and clouded in mist and the tablet in your hands reflects that which you always knew to be real, you will make your role clear, and bear witness to your endeavor's conclusion.
Reconcile.

Alpha Notice
Halcyon is in alpha. What that means is twofold. First, that it is not a complete experience: you can currently progress up to the beginning of the Third Tier. That can take but a few hours if one knows what they're doing, certainly more if not. Second, that along the way, content may be changed drastically. Back up your world before any updates, and do not expect major updates to work well without a new one. But when all is said and done, Halcyon is planned to have many tens of hours of content.
Features
-what are its instruments, its voices?-
- Many machines both familiar and fresh; the heart of a magitech factory
- Logistics with which to move around your factory's spoils
- Several useful tools and other creations of artifice
- Multiple world-traversal items, including a grappling hook
- A scarred past, an expansive history for you to explore
- A changing world whose hidden truths surface as you listen to its stories
- Multiple sets of thematic building blocks: obsidian, copper, and more
- New structures in which your precious knowledge is sealed away
- Data-driven progression system focused on puzzle-solving and exploration
- The Song of the Factory, an ever-growing musical monument to your endeavors
- And more
Mod Integration
-does it resonate to me, and me alone?-
- Applied Energistics 2:
- Process AE2's materials with Tide-driven machinery
- EMI:
- Full recipe display support, with thematic visuals and progression-based recipe hiding
- Malum:
- Ability to locate a certain... thing with the Resonance Receptor
- New ways to process the spoils of your Wicked Harvests
- Mekanism:
- A new set of Nodes and Wires for transferring Chemicals
- Opalescence:
- Opal variants of Traversite Road blocks
- Oritech:
- Recipes to make Oritech alloys in the Synthesis Chamber for half the cost
- Pastel:
- New ways to process the materials of your Artistry
- Some Pastel items can serve as powerful sources of Tidal Energy
- More interop will be added as both mods flourish further!
- Primal Magick:
- Ability to locate the Shrines a mage requires with the Resonance Receptor
- Refined Storage:
- The Tides beget more efficient methods to create your base RS components
- Tempad:
- While there is no Tempad integration in Halcyon itself, we recommend the addon Tides of Time, made by a close friend of the project. It fully subsumes Tempad into Halcyon's progression, including a new structure and changed recipes.

Credits
-who composed the song, this distant dream?-
Primary developers
- Esét Kalenko: Lead Art/Narrative Designer - Esét's KoFi
- Fuzzy: Lead Composer
Contributors
- Cimdy: Former programming lead, shader sorceress, lots of background lore
- DavidRarria09: Additional music
- K King: Sound designer - K King's KoFi
- Multyfora: Programming, render wizardry
- Qther/Vonr: Performance improvements
- TheRobbie73: Sable compatibility
Translators
- Chinese: ChujikYahus, dovisutu, ZetaY
How to Install Halcyon | Data & Essence (Mod)
Halcyon | Data & Essence by EsetKalenko is verified for Neoforge across Minecraft versions 1.21, 1.21.1 (latest release: 0.4.3+aria-of-the-moon, file size: 19.6 MB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.21, 1.21.1) and platform (Neoforge).
- Make sure you have the compatible loader or environment installed for Neoforge.
- Move the downloaded Halcyon | Data & Essence file into your Minecraft
.minecraft/modsfolder and launch the game.
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- Data Drives do not crash if their loaded entry doesn't exist (Esét)
- Missing data entries in a variety of places no longer outright throw exceptions or crash (Esét)
- Transcendental Tether no longer makes you have infinite speed (TheRobbie73)
- Wandering Wires should no longer crash for real this time (Esét)
- Lunar Synthesis theme (Fuzzy)
### Fixes
- Corrected the Lunarium's unlock requirements (Esét)
- Fixed a crash with the Wandering Wires puzzle (Esét)
- (WIP content) The Spike now accepts fluid (Esét)
- This is a world-breaking update! You _MUST_ start a new world after updating!**
### Additions
- Astronomy Towers (Esét)
- Shards of Transformation, and the means to obtain them (Esét)
- Ecliptrum alloy and associated components (Esét)
- Lunar Nodes and Wires (Esét)
- The Lunarium
- Frozen Moonlight (Esét)
- Crystallization Charges (Esét)
- Progression Sharing via player-built Data Banks (Esét)
- The Repulsion Rod (Esét)
- RF Nodes and Wires (Esét)
- Sustenance Siphon (Esét)
- Storage blocks for Shards of Industry and Shards of Transformation (Esét)
- Malum compat for the Mineral Purification Chamber (Esét)
- Some more Pastel compat recipes (Esét)
- Some Malum compat recipes (Esét)
- Added energy value tooltip to Shard Burner gui (Esét)
- Added drying recipe for milk into slime (Esét)
- Added "Conductor's Lullaby" music disc (Esét, Fuzzy)
### Removals
- Config value for Tidal Energy Battery capacities (Esét)
### Changes
- Modid rename - "datanessence" -> "halcyon" (Esét)
- Changed click sounds for Shifting Hues to all be ui_click (Esét)
- Data Bank Entries are now more vague on what they unlock (Esét)
- Moved Mineral-Finding Rod to t3 (Esét)
- Rethemed the Metal Shaper's work process and mold items to be more akin to 3d printing (Esét)
- Updated zh_cn translation (ChuijkYahus)
- Shard Burners now spawn gaseous clouds when they sublimate shards (Esét)
- Shard Burners' sublimatable items are now data driven (Esét)
- Buffed Tethergrass spread rates (Esét)
- Recipes now hide in EMI if you do not have the data for their machine, like in the Data Tablet (Esét)
- Recipes are able to be hidden in EMI if their associated data entry is incomplete no matter what (Esét)
### Fixes
- Improved Node performance by switching from JGraphT to JGAlgo (Vonr)
- Nodes now work with Sable sublevels (TheRobbie73)
- Structure Pings no longer disappear while the game is paused (Esét)
- Fixed Tidal Energy Meter's right-click action being totally nonfunctional on servers (Esét)
- Fixed Wire connection limit not being adhered to in all connection directions (Vonr)
- Fixed Twining Lanterns causing a disconnect if you unload then reload them (Esét)
- Fixed completion stages not working properly with hidden advancements (Esét)
- Changed the tier text translations to be per-tier (Esét)
- Made the tier display in data banks more thematic (Esét)
### Fixes
- Fixed progression being reset when updating from 0.3.4 and below - if you already updated to 0.3.5, this will reset you again! (Esét)
- Fixed Malum [REDACTED]s being located on the main mode of the Signal Tracker (Esét)
- All current t3 and t4 content - none of it is obtainable in survival right now (Esét)
- More Pastel crushing compat (Esét)
- Tooltip display and associated item tag for WIP/unfinished content (Esét)
- Structure Music for Abandoned Factories (Esét, Fuzzy)
### Changes
- Tidal Furnaces' speed bonus is now 50%, as opposed to 25% (Esét)
### Fixes
- Fixed Infusers being uncraftable without first having obtained one (Esét)
- Fixed Pure Zinc (Pastel) not being processable in the Mineral Purification Chamber (Esét)
- Fixed (Energized) Ancient Rock Columns not actually rotating (Esét)
- Improved performance for Nodes (Vonr)
- Fixed Mekanism integration Chemical nodes duping and voiding chemicals (Esét)
- Fixed Makutuin Runner Carpets not rotating with the structures they are placed within, for real this time (Esét)
- Industrial Infuser recipe for more efficient Charcoal production (Esét)
### Changes
- Nerfed the output of Pure Netherite (Pastel) in the Mineral Purification Chamber (Esét)
- Traversite Road can be crafted out of Calcite as well as Diorite (Esét)
- Updated zh_cn (ChuijkYahus)
### Fixes
- Fixed Primitive Antigravity Pack's fuel effectively being infinite (Esét)
- Fixed incorrect Quartz Flakes:Nether Quartz crafting ratio (Esét)
- Fixed Auto-Fabricator's item sidedness being incorrect for new model (Esét)
- Fixed Makutuin Runner Carpets not rotating with the structures they are placed within (Esét)
- Fixed missing recipe for Tag Filter Labels (Esét)
- Added "arcane resonance seeking" upgrade for the Signal Tracker, allowing it to find certain structures from other mods (Esét)
- Added Makutuin Runner carpet-type block (Esét)
- Added some more advanced crafting components (Esét)
- Added tag filter labels for filter slots (Esét)
### Removals
- Removed the "maximize" command; it never truly worked right (Esét)
### Changes
- Added Runners and an additional loot chest to Arekko's Vault (Esét)
- All Rod recipes now require a new advanced crafting component (Esét)
- Auto-Fabricators can be disabled by applying redstone (Esét)
- Auto-Fabricators won't craft until all their locked slots are filled (Esét)
- Hammer and Chisel recipe changed to require only one diamond (Esét)
- Overhauled visuals of Auto-Fabricator (Esét)
- Renamed Essence to Tidal Energy, and subsequently cast off the "Data & Essence" title in all but on a technical level (Esét)
- Rewrote a bunch of the Data Tablet (Esét)
### Fixes
- Fixed Auto-Fabricator's remainder handling... AGAIN (Esét)
- Fixed Light Fixtures not being mineable with an empty hand (Esét)
- Chargeable items show sparks of Essence behind them when charged (Multyfora)
### Fixes
- Fixed Crash with Fabricator (EVIL SPIRITS unpopped your pose)
- Fixed Crash when visiting Pastel's Imbrifer
- Added color accessibility indicator to Luminous Redirection data bank puzzle (Esét)
- Added Fabricator working vfx (Multyfora)
- Added Halcyon to Data & Essence (i.e. renamed the mod) (Esét)
- Added Mushrooms and Vines to Plant Siphon fuel map (Esét)
- Added Quartz to Mineral Purification Chamber (Esét)
- Added sound for using a Redirector (Esét, K King)
- Added tutorial data entry for using Nodes (Esét)
- Added Twining Lanterns, new decorative lights that have certain functions when powered (Esét)
- Pastel Pure Resources can be processed in the Mineral Purification Chamber (Esét)
### Changes
- Critical Data shows different icon frames in Data Banks (Esét)
- Essence Furnace and Shard Burners now emit light when working (Esét)
- Primitive Antigravity Pack safe fall distance height increased (Esét)
- Renamed Essence Burner to Shard Burner, and reworded its tablet entry (Esét)
- Retextured and adjusted recipe for Illumination Rod (Esét)
- Tweaked Fabricator texture, giving it some oxidization and bringing the amethyst cube in line with Pastel amethyst (Esét)
- Tweaked Fluid Bulb side texture to differentiate it from Fluidic Glass (Esét)
### Fixes
- Documented Filter Sigils' ability to filter fluids (Esét)
- Fixed erroneously larger values than the actual averages displaying in Mineral Purification recipe cards (Esét)
- Essence Furnace doesn't get strange when inserting items before Essence anymore (Esét)
- Added a command to instantly charge items with Essence (multyfora)
- Added information about the Industrial Plant Siphon's current fuel in its gui (Esét)
- Added Pastel gemstone shard "reconstruction" syntheses and data entry (Esét)
- Added Survey Tunneler machine, inspired by and serving a similar function as BuildCraft's Mining Well (Esét)
- Polished Obsidian variants can now be used to build Nether Portals (multyfora)
### Changes
- Charger now shows what item is inside it, and its charge level, in its Essence Meter display (multyfora)
- Data Tablet screen can be closed with the inventory key (multyfora)
- Entropic Processor now inserts items dropped on top of it to its input slot (multyfora)
- Essence Batteries retain their Essence contents when broken (multyfora)
- Essence Light Fixture has collision (multyfora)
- Fluid Bulbs retain their contents on being broken (multyfora)
- Fluid Bulbs transfer fluid to other Bulbs below them, allowing vertical stacking (multyfora)
- Lightslash Blade's attack speed is constant again instead of variable, fixing its lack of proper cooldown (Esét)
- Interaction with the Charger is now in-world, instead of via a GUI (multyfora)
- Interaction with the Enticing Lure is now in-world instead of via a GUI (multyfora)
- Nodes may now customize the color of their wires' "pulses" (Esét)
- When pick-blocking a Node, sneaking now picks its correspondent wire (multyfora)
### Fixes
- Corrected voxel shapes for several blocks (multyfora)
- Fixed crash when the Ender Redirection Pearl Absorber encounters an ownerless ender pearl (multyfora)
- Added a block tag #datanessence:structure_protector_ignored, for blocks a Structure Protector will not cancel the placing/breaking of
- Added distance display to the Signal Tracker
- Added new Copper Vent deco block
- Added a Factory Song volume client config setting
- Added new Assembly Actuator and Essence Pathways crafting components
- Added more efficient Logical Matrix synthesis recipe
- Added mouse-based structure rotation to Data Tablet multiblock page
### Changes
- Allowed all machines to accept item inputs on certain sides via non-buffer methods (sides that allow inputs are detailed in the Data Tablet)
- Retextured Bonding Powder, Data Tablet, Essence Redirector, Essence Sword, Lensing Crystal
- Tweaked several other sprites
- Edited animation timing of Signal Tracker
- Renamed Essence Sword to Lightslash Blade, and tweaked its functionality
- Tagged the Essence Redirector as a wrench
- Added diamond and emerald to Mineral-Finding Rod's recipe
- Factory Song loops are not disabled by muting the Blocks sound category any more
- Synthesis Chamber requires an Essence Pathways instead of Logical Matrix
- Auto-Fabricator requires an Assembly Actuator
- Data Tablet hides recipes you do not know about yet, as in EMI, and additionally hides recipes using machines you have not unlocked
- Data Tablet displays craft time on recipe cards, as in EMI
### Fixes
- Fixed Essence Burner voiding fuel remainders (e.g. buckets); it now expels them out into the world
- Fixed (Auto-)Fabricators' issues with crafting remainders (e.g. buckets, bottles) again
- Fabricators do nothing and log a warning if their current recipe has an empty result or empty ingredients
- Fixed Essence Sparkle animation frame order
- Fixed Server Crash regarding the Essence Reader's color handler