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Negentropy Singularity
Dark Fog
Initial experiments hadn't identified any special properties of the substance. Yet when we keep inputting energy, it spontaneously shows weak negentropy.
Summary
This material is obtainable by killing Dark Fog units that are level 21 or above and having it in your inventory unlocks the hidden research Negentropy Recursion, allowing you to unlock a 3rd tier of smelter. Additionally it is a component used to produce that top tier smelter.
For more information, please check the Dark Fog Debris loot table.