Astrum
Astrum is a GTNH extension compound made from Lux and Primordium. One point costs 6 primal points to synthesize from scratch.
Recipe
Astrum = Lux + Primordium
Combine one point of each component at the research table to get one point of Astrum. Counting all the way down to primals, a single point takes 6 primal points:
That total is the number the solver shows as craft cost when it places Astrum in an empty cell.
What Astrum connects to
Astrum links to 2 aspects in this library (see the connection rule): its two components.
| Neighbor | Why it connects | Craft cost |
|---|---|---|
| Lux | Component of Astrum | 2 |
| Primordium | Component of Astrum | 4 |
No compound in this library is built from Astrum, so its only neighbors are its own components. A fixed Astrum on a note has to be approached through Lux or Primordium.
When Astrum is printed on your note and you only need to leave it, Lux is the cheapest first step at cost 2.
Reaching Astrum from each primal
These are the shortest valid chains in this dataset, using base and GTNH extension aspects. Where several chains tie on length, the one with the cheapest in-between aspects is listed. Cost counts only the aspects between the two ends, the cells you would have to fill.
| From | Chain | Cells to fill | Cost |
|---|---|---|---|
| Aer | Aer → Lux → Astrum | 1 | 2 |
| Terra | Terra → Iter → Motus → Primordium → Astrum | 3 | 9 |
| Ignis | Ignis → Lux → Astrum | 1 | 2 |
| Aqua | Aqua → Tempestas → Aer → Lux → Astrum | 3 | 5 |
| Ordo | Ordo → Motus → Primordium → Astrum | 2 | 6 |
| Perditio | Perditio → Vacuos → Primordium → Astrum | 2 | 6 |
A real note also has geometry: the chain has to fit the free hexes between your endpoints. If the gap is longer than the chain, pad it by stepping back and forth between two aspects that connect, or let the solver find a layout that fits.
Data source
Astrum is in the GTNH extension group. Its default commonness is 28 out of 100, an editable estimate used by the Common ranking. The component pair was compared with GTNewHorizons GregTech aspect registration. The recipe table covers every component pair and the version limits.