Fungi are know to form colonial systems similar to nervous ramifications when in large amount of land.
They cannot move, but the entire colony can react to the harm of one subsection and adapt to it so there’s that.
Also, some fungi develop symbiotic relations with other species (lichen for example), so maybe they could live on the back of some mobile animal and provide protection against some kind of parasyte or infection (if that exists in the game).
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