To get this guy you simply have to build a suitable house made out of glowing mushrooms. Then he'll show up. He sells a variety of items , the Autohammer which is used to produce Shroomite bars that you can use to create one of the best ranged armor sets in the game , Truffle the pet , Dark Blue Solution for the Clentaminator , a Spear and Hammer and a Mushroom hat.
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The Truffle is a hard mode NPC and will only show up once you have constructed a house in an...