I have been writing up the combat statistics for this creature here. They are a species of sentient fungus that have evolved over time.
There's three types. Ones that appear as amanita panthera that are the warriors and produce spores that make enemies weak physically (and is used medicinally to as a muscle relaxer).
Others that appear as hericium erinaceus (commonly called "lion's mane") that are the workers that gather dead vegetation for the "feeding gardens", and produce spores that heal other mycelial creatures (and is used medicinally as a disinfectant).
Lastly are the ones that appear as our friend above, aminita muscaria (the "magic" mushroom) are the Weavers of the community, stitching spells together to protect the community with strong magics, producing spores that makes enemies even more susceptible to magic (and is used socially like drinking or smoking weed).
I find them very adorable. I will be drawing the other two types and posting them soon.