Metal-eating spore
- The metal-eating spore is a piece of organic technology in the Generation 1 continuity family.
Metal-eating spores are fungus that can devour metal in extremely little time. It was developed by Cobra-La to use against Unicron.
Fiction
As the undisputed masters of biotechnology, Cobra-La developed a fungus capable of devouring metal within a moment's notice when the Chaos Bringer arrived to consume Earth 160,000 years ago. Effectively threatening him with it, Cobra-La made a deal with the metal god to sacrifice the human race to him when they had become numerous enough to be a sufficient meal. Black Horizon, Part 1 of 2
The Yeti in service of Cobra-La continued the cultivation of the spores in wait for Unicron, in case matters would not unfold as agreed. When a counterforce was launched against Cobra-La, Flint and Joe Colton made their way to the spore farm, where they fought the Yeti for the only weapon against Unicron available. Cosmos came to their rescue. Though Joe at first warned him to stay at a distance because of the danger the spores posed to him, it was soon enough decided Cosmos was the only one both suited and present to bring the spores to where they would be useful: inside Unicron's head. Flint went along with the Mini Vehicle in order to keep him safe. After the expected obstacles, Flint used his one chance well to get the spores all over Unicron's brain.
Or as he put it:

