Shroomite Bar

Shroomite Bars can be crafted by standing near an Autohammer with a Chlorophyte Bar and 15 Glowing Mushroom. These bars are so far used in the Shroomite armor and the Hoverboard. You need 810 Glowing Mushrooms and 54 Chlorophyte Bars to make the Shroomite armor; For the Hoverboard, you need 270 Glowing Mushrooms and 18 Chlorophyte Bars.

Trivia

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