Finding out the fae are parasitic fungi, huh.
Wander into a fairy circle, just a circle of mushrooms, come back different from that. Wonder what happened there? Got mushrooms in the brain didn't they?
Wander into the woods, eat strange food drink strange water, see a strange world, keep going back to the woods for more and why has this happened, what enslaved them? Brain fungus isn't it?
They don't live in this world do they, they speak to each other in strange tongues, flit across the world invisibly, appear in many illusionary forms.
We built our world over top of theirs.