Demonite Ore

Demonite Ore drops from the Eye of Cthulhu and the Eater of Worlds and can be refined into Demonite Bars. Together with Shadow Scales, Shadow armor and Demonite weapons and tools can be crafted. As with other Ores, it can be placed by the player. If you wish, you can sell each Ore for 8 Silver Coins.

It has the same glow as the now-absent Cobalt Armor (Cobalt Armor was replaced by Jungle Armor in 1.0.3 patch), and can be seen through otherwise solid walls because of the faint light it gives off.

New to the 1.0.5 patch is the ability of Demonite Ore to be generated within the world itself, typically underground. However, these veins of Demonite tend to be very small and the best way to acquire larger quantities is to defeat the Eye of Cthulhu and the Eater of Worlds. In fact, in previous versions, the only way to acquire Demonite Ore was to defeat these two bosses.

Should not be confused with Ebonstone Blocks, as they look very similar.