This page contains many spoilers, proceed at your own risk!
The Erchius Converter can be found in Precursor Dungeon. Used to turn most ship fuels into superior Precursor Quantum Fluid and the latter into Ancient Essence. Be aware that there is also a Faulty version that produces Bags of Farts instead of Quantum Fluid.
Extraction Recipes [v5.6347]
|Liquid Erchius Fuel x 200||Subspace Flux Fluid||10s|
|Crystal Erchius Fuel x 100||Subspace Flux Fluid||10s|
|Erchius Crystal x 20||Precursor Form-Gel x 2||15s|
|Toxic Waste x 100||Subspace Flux Fluid||10s|
|Liquid Irradium x 25||Precursor Quantum Fluid||30s|
|Irradium Bar x 5||Precursor Quantum Fluid||40s|
|Uranium Rod x 25||Precursor Quantum Fluid||40s|
|Enriched Uranium (U) x 10||Precursor Quantum Fluid x 2||30s|
|Plutonium Rod x 22||Precursor Quantum Fluid||50s|
|Enriched Plutonium (Pu) x 8||Precursor Quantum Fluid x 2||30s|
|Neptunium Rod (Np) x 30||Precursor Quantum Fluid||70s|
|Thorium Rod x 27||Precursor Quantum Fluid||60s|
|Solarium Star x 15||Precursor Quantum Fluid x 2||30s|
|Ultronium (Ux3)||Precursor Quantum Fluid x 5||12s|
|Precursor Quantum Fluid x 50||Ancient Essence x 1||20s|
|Crunchy Chick||Ancient Essence x 5||10s|
|Crunchy Chick Deluxe||Ancient Essence x 50||10s|
|Crunchy Evil Chick||Ancient Essence x 100||10s|
Poison, as found on Toxic Ocean planets, can be a viable way to obtain limitless amounts of Precursor Quantum Fluid. If you place Poison in a centrifuge, one of the resulting ingredients is Toxic Waste, which in turn can be placed in an extractor to extract Uranium Ore from. Forge the resulting Ore into Rods and you'll have fuel to convert. Given that poison is an easily obtained resource, this means you have easy access to Uranium for this device.
On the Other side you could make a factory that produce endless elder fluid ( even in a simple ocean planet you can make a factory with pumps to turn water into poison, poison into organic soup and organic soup into elder fluid) Centrifuging the elderfluid will give great amount of plutonium to convert into ancient essence. The rest of the fluid can be used to power reactors and the organic soup made before can be used to water crops AND act as fertilizer)
This item is tagged under "precursor" for colony building.