Spores from the parasitic fungi called the cordyceps infects an insects brain and directs the insect upwards towards the forest canopy where it latches onto a plant to eventually die.
After growing for about 3 weeks within the dead insect, the cordyceps unleashes spores into the forest, infecting other insects within the immediate area. There are thousands of different types of cordyceps fungi and each specialise in just one type of insect species.
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Time's Vengeance 