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Matter Recombinator
Dark Fog
Obtained from Dark Fog Debris. Research reveals that this substance has powerful decomposing and re-composing capabilities. It can instantly decompose matter into particles, and then re-compose these particles as designed to generate a different type of matter.
Summary
This material is obtainable by killing Dark Fog units that are level 15 or above and having it in your inventory unlocks the hidden research Matter Recombination (Tech), allowing you to unlock a 4th tier of assembler. Additionally it is a component used to produce that top tier assembler.
For more information, please check the Dark Fog Debris loot table.