Unholy Water

Unholy Water is a thrown consumable weapon that deals 20 damage on impact, while also transforming a small number of blocks at the impact site into Corruption, which can then spread to neighboring blocks. It affects blocks within a 9-tile radius of the impact point, corrupting up to 57 blocks total.

Unholy Water requires Ebonsand to be crafted, which comes into existence when Corruption overlaps Deserts, though other Corrupt areas may still have converted underground Sand Blocks to Ebonsand during world generation. Ebonsand becomes more common in Hardmode.

It has a hallowed counterpart in Holy Water. In the PC version, it also has a Crimson equivalent, Blood Water.

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