Soul of Light

Soul of Light is a Hardmode crafting material dropped by all enemies in the Underground Hallow. This includes stray enemies not native to the biome, such as Goblins and Meteor Heads. Crafting all items, including a full stack of five Light Discs, but excluding the Boss-summoning items, requires 115 Souls of Light. One of each Boss-summoning item requires an additional 12 Souls of Light, for a total of 127.