A fluid produced by cleansing blood taken from the Monarch of Demons. Still faintly venomous despite its refinement and dense with magical energy, it serves as one of the ingredients for the Holy Water of Life.
This crafting component is what remains once the Demon Monarch's own blood has been drawn off and purified. It comes housed in a rounded, see-through vial brimming with a deep purple liquid, its glass neck and body dressed in golden patterns and elaborate ornamentation. Refinement does not strip away everything: the fluid still pours out powerful magic and clings to a sliver of toxicity.
The leftover poison means the blood cannot safely be drunk by itself. Turning it into workable medicine calls for two additions: Spring Water drawn from the Forest of Echoes, together with a Fragment of the World Tree. Blended correctly, the result feeds into the recipe for the Holy Water of Life.
Within the Demon Castle Arc, Jinwoo claimed this item once he had beaten Baran atop the hundredth floor, and it proved to be the last piece he still lacked to brew the Holy Water of Life. Far later, in Ragnarok's Demon Monarch Successor Arc, Esil Radiru, now crowned the new King of Demons while also reigning as Gluttony's Monarch, called on the demon king's signature Blood Crystal skill to regrow her own blood and pass it to Suho, who needed it to make the Holy Water of Life and cure his grandfather Sung Il-Hwan.

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The Purified Blood of the Demon King is a fluid made by cleansing blood drawn from the Monarch of Demons. It comes housed in a rounded transparent vial of deep purple liquid and stays dense with magic and faintly toxic even after refinement.
The Purified Blood of the Demon King is one of the ingredients for the Holy Water of Life. Because leftover poison makes it unsafe to drink alone, it must be blended with Spring Water from the Forest of Echoes and a Fragment of the World Tree before it feeds the recipe.
During the Demon Castle Arc, Sung Jinwoo claimed the Purified Blood of the Demon King after beating Baran atop the hundredth floor. It proved to be the last piece he still lacked to brew the Holy Water of Life.
In Solo Leveling: Ragnarok's Demon Monarch Successor Arc, Esil Radiru, the new King of Demons and Monarch of Gluttony, used the demon king's Blood Crystal skill to regrow her own blood and pass it to Suho, who needed it to make the Holy Water of Life and cure his grandfather Sung Il-Hwan.
Refinement does not strip away all of its toxicity, so the Purified Blood of the Demon King still clings to a sliver of poison and cannot safely be drunk by itself. It must first be turned into workable medicine as part of the Holy Water of Life recipe.
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