Ebonstone Block

Ebonstone Blocks are the blocks that primarily comprise Chasms in The Corruption. These blocks encase Shadow Orbs and most Demon Altars. They can only be mined with a Nightmare Pickaxe or higher, Dynamite and Bombs, or Purification Powder (which turns Ebonstone into ordinary Stone).

Placing 200 of these blocks causes the regular ground to transform into The Corruption or Underground Corruption biome, which will spread and attract their mobs, such as Eater of Souls and Devourers. This can be used to the player's advantage to make a suitable arena for fighting the Eater of Worlds. Deathweed can grow on Ebonstone.

At hardmode any corrupted block will turn regular stone blocks that are up to three squares away into Ebonstone.