Unholy Water

Unholy Water is a consumable weapon that transforms a small area into The Corruption when thrown. It is the Corruption counterpart to Holy Water.

It is Hardmode-only in the console release because it requires Ebonsand to craft, which can only be obtained with the Corruption spreading into deserts in Hardmode. However, in the PC release, Ebonsand can be created during world generation should the Corruption overlap any sand, thus making this item available pre-Hardmode.

Unholy Water deals 20 damage on whatever it hits and thus can be used as a weapon, albeit a rather dangerous one since it turns the impact site into Corruption.