Deadly Mushroom sell to vendor Sateal Deirosap in the bazaar for 0 plat 0 gold 1 silver 0 copper offered by a level 2 human monk with 143 cha.... Current bazaar price is 1 plat....
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Actually the one that drops in Dawnshroud is called "a deadly mushroom". It lists: WT: 1.0 Size: Tiny Class: ALL and Race: ALL It's graphic is different too, it looks more like a button mushroom. And it is unstackable.
Still haven't figured out what it's for, but it dropped from a Fungi Shroom.