Ghoulstool

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The Ghoulstool is a species of sporovid that produces corruptive spores capable of directly harming Onions.

=In fanon games=

In Pikmin Rebirth
The Ghoulstool is a species of sporovid appearing in Pikmin Rebirth. They can be identified by their olive-green cap, and a texture resembling advanced decay. They are one of the subterranean sporovid varieties, living deep inside cave systems, particularly cold and damp ones at that. They are considered a parasite due to absorbing the nutrients of their surroundings, leaving only their spores in their wake. These spores, however, are different as, rather than infect Pikmin, they instead infect rotting matter such as corpses. These spores, while not directly harmful, can damage Onions when delivered to one by a corpse; rather than add a number of seeds, the corpse subtracts that amount, effectively killing Pikmin still in the Onion. Furthermore, be wary of nectar in the Ghoulstool's environment, as there is a chance that it could be infected with spores as well, turning it into fermented nectar. If Pikmin drink this nectar, they are converted into hostile Puffmin and assist the Ghoulstool in fighting. To prevent the Ghoulstool from polluting its surroundings, defeating it as soon as possible is a wise decision. However, the Ghoulstool can attack directly; namely, it can produce a special olive-green spore cloud that degrades the maturity of Pikmin, and unlike poison, this will reduce their maturity by one stage but is lethal if they are at leaf stage.