Soul of Night

Soul of Night is a Hardmode crafting material dropped by all enemies killed in the Underground Corruption or Underground Crimson, with a 20% chance. This includes stray enemies not native to the biome, such as Goblins or even monsters native to the Hallow. Crafting all items, excluding the Boss-summoning items, requires 87 Souls of Night. One of each Boss-summoning item requires an additional 12 Souls of Night, for a total of 99.

Used in
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Tips

 * A fast way to farm these is to summon the Eater of Worlds at a sufficient depth, as each of his segments counts as a monster - Provided you have enough power to handle the situation, considering he is reinforced by regular spawns in the underground. Immunity to knockback goes a long way. Another method is to use the dungeon if corruption has spread to part of it. This method also works with the Hallow.