"The Pikaati breathe hydrogen cyanide. The helmet flooded as soon as she activated the seal. Open that, and you could put the rest of us in danger."
Wilhuff Tarkin, to Denetrius Vidian after Thetis Quelton committed suicide using hydrogen cyanide[src]

Hydrogen cyanide was a gas breathed by the Pikaati species. It was extremely poisonous to humans, who could perish if they inhaled the gas.[1]

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