Mr Mushroom (Mister Mushroom) is a secret NPC in Hollow Knight who gives you a sort of side quest which unlocks a new ending to the game. There is also an achievement tied to completing this quest called “Passing of the age”. After reading a tablet inscription, the quest triggers and you must find him across various maps. To talk to Mr Mushroom be sure to wear the Spore Shroom Charm. Below is all the Hollow Knight Mr Mushroom locations:
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Did everything and still didn’t get the achievement! Wth
btw you also need to kill all three dreamers for him to show up
Spoke to the tablet, and gone to Fungal wastes, but he is not there… Any chance I missed it somehow? Or I still have to do something before he appears?
You need to be holding the spore shroom notch.
Correct! Thanks. I’ve updated that.