Noctocyanin was a plant-based medical blend. When ingested, it heightened a person's awareness. Diamond Dogs and various PMCs during the 1980s utilized this drug.

Behind the scenes

Noctocyanin is an item that appears in Metal Gear Solid V: The Phantom Pain. It allows the player to sense enemies and organisms for a brief time, even if they hadn't been marked beforehand.

"Special medicinal plant blend that heightens awareness. For a limited time, makes user of nearby organisms without having marked them.
Use: [R3 stick]
―Noctocyanin menu description in Metal Gear Solid V: The Phantom Pain

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