Soul of Light

Soul of Light is a Hardmode crafting material dropped by most enemies killed in the Underground Hallow (in the Cavern layer) with a 1/5 (20%) / 9/25 (36%) chance. This also includes enemies not native to the biome such as Granite Elementals.

Crafting all items, including a full stack of five Light Discs and excluding the boss-summoning items and Key of Light, requires  118 /  109 /  89 Souls of Light. One of each boss-summoning item and a Key of Light require an additional  24 /  14 Souls of Light, for a total of  142 /  133 /  103 Souls of Light.

Tips

 * One of the best ways to farm for Souls of Light is to go to the Underground Hallow, and deep underground where lava spawns frequently, and place a few Water Candles. The enemies the Underground Hallow spawns do not go through blocks (except for Enchanted Swords) and are not special in any real way, so they get affected by the lava and drop Souls of Light. This is also effective for any other item dropped by Underground Hallow enemies.
 * Another easy way to farm these is to go to the Underground Hallow and summon King Slime using the Slime Crown. All of the Blue Slimes he summons have a chance to drop Souls of Light (this method will also work for the Soul of Night).

History
Desktop version


 * Desktop 1.4.0.1:
 * You can no longer get Soul of Light from King Slime's minions.
 * Now used to craft the Soul of Light in a Bottle and Cool Whip.


 * Desktop 1.3.3: Now used to craft the Sky Fracture.


 * Desktop 1.3.1: Now used to craft the Logic Sensor (Day).


 * Desktop 1.3.0.1:
 * Sprite updated. Previous sprite was.
 * Drop rate increased for Expert Mode worlds.
 * No longer used to craft the Neptune's Shell.
 * Now used to craft the Chik, Meteor Staff and Key of Light.


 * Desktop 1.2:
 * Drop rate increased from 1 in 7 (14.29%) to 1 in 5 (20%).
 * Stack limit increased from 250 to 999.


 * Desktop 1.1: Introduced.

Console version


 * Console 1.0.933.1: Made changes from PS4's 1.0.750.0 update.


 * Console 1.0.750.0: (PS4)
 * Sprite updated to match Desktop 1.3.0.1.
 * Drop rate increased for Expert mode worlds.


 * Console 1.02:
 * Drop rate increased from 1 in 7 to 1 in 5.
 * Stack limit increased from 250 to 999.


 * Console-Release: Introduced.

Switch version


 * Switch 1.0.711.6: Introduced with changes up to Desktop 1.3.0.1.

Mobile version


 * Mobile 1.3.0.7:
 * Sprite updated to match Desktop 1.3.0.1.
 * Drop rate increased for Expert mode worlds.


 * Mobile 1.2.6508:
 * Drop rate increased from 1 in 7 to 1 in 5.
 * Stack limit increased from 250 to 999.


 * Mobile 1.1.5536: Made obtainable.


 * Mobile 1.1.8: Introduced, but unobtainable.

3DS version


 * 3DS-Release: Introduced with changes up to Desktop 1.2.