Soul of Light

Soul of Light is a Hardmode crafting material dropped by all enemies in the Underground Hallow with a 20% chance. This includes stray enemies not native to the biome, such as Goblins or even monsters of "evil" biomes like The Underworld. 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 12/41 Souls of Light (PC/Console), for a total of 127/156.One way to harvest souls of light is to trap a Slime King and continously attack it with weak weapons so it can stay alive but, continously summon alot of blue slimes, after the slimes have been summoned, kill them all, then repeat the process over and over again, this should give you 5-15 souls. The weaker the weapon you use, the more souls you'll get, so i recommend using shurikens or throwing knives.

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Tips

 * A very easy way to farm them is to go to an Underground Hallow biome near Lava and allow the enemies there to die in lava, since the souls are of higher than blue rarity, they won't be affected by the Lava.