Soul of Fright

Soul of Fright is a Hardmode crafting material dropped by Skeletron Prime. They are used to craft several end-game items, including the Flamethrower. To craft both the Neptune's Shell and the Flamethrower, one need only fight Skeletron Prime a maximum of twice. Crafting all items (including the console items) requires 80 Souls of Fright, meaning the player must defeat Skeletron Prime at least twice to gather the souls required (2-4 times is required).