Mushroom Trader

I thought about a mushroom boss you can find on mushroom islands, but mushroom islands are completely docile so an entity that can attack you isn't thematic. 

My idea is a trader exclusive to mushroom islands that will give you unique resources either based on mushrooms or archaeology. The trader doesn't respawn, but their trades can change daily (to encourage the player keeping them around, even if their trades aren't good). 

Since mushroom islands are so rare, cartographer villagers should sell maps leading the player to the nearest mushroom island.