Shroomite Bar

Shroomite Bars can be crafted by standing near an Autohammer with a Chlorophyte Bar and 15 Glowing Mushrooms. These bars are so far used in the Shroomite armor, the Hoverboard and the Shroomite Digging Claw. You need 1170 Glowing Mushrooms and 78 Chlorophyte Bars to make a full Shroomite armor (including all 3 head parts); For the Hoverboard or the Shroomite Digging Claw, you need 270 Glowing Mushrooms and 18 Chlorophyte Bars each. So, to craft one of every Shroomite item available, you need a total of 1710 Glowing Mushrooms and 114 Chlorophyte Bars.

As the Autohammer can only be bought after Plantera is defeated, Shroomite gear and armor are restricted too. They can still be obtained before Golem and the endgame moon events though.

Trivia

 * Shroomite Bars and Hallowed Bars are the only bars in the game that do not have an ore.