The demonite item, as it appears in Terraria

Demonite is made from normal metals eaten by the Eater Of Worlds and then passed through it's system and changed into its corrupt form. The Eater then spits it out and, this way, it spreads the corruption over the land. It's used to make demonite bars.


Demonite ore found naturally in Terraria. (Note: The character in the picture never appears in LoM.)