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. Using Purification Powder will turn it into ordinary stone block.

Placing 200 of these blocks causes the current biome to transform into The Corruption or Underground Corruption biome, which will spread and spawn 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.

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