Created by the so-called Titans to be the Celestial of Light, Zalgo shaped the Angelic Realms and the holy powers kept within them. He was the embodiment of all good in existence to which all mortals and even celestials looked up to. This blissful existence however was not to last. Exactly how Zalgo fell has remained a mystery, but it was clear something corrupted his heart.

Zalgo became the Celestial of Darkness and Insanity, taking on a horrific form of a giant sea monster formed only from dark matter and disgusting slimy skin. His tendrils can appear from anywhere on himself as they seek to grab anything they can corrupt. Primarily his focus is on the mind. His followers devote themselves blindly to him believing he will open the eyes of all mortals to his glorious rule. Those who come across his magic or matter find themselves haunted by maddening whispers and cries. The weak minded become mindless, and even the strong willed begin to question their own thoughts.

On the day of Christmas 2563 Zalgo almost entered the mortal realm fully, summoned by a maddened Dan Almis and the already mad necromancer Lana. He was however driven back and defeated by the ascension of Dan to Celestialhood, with a banishing curse being lain upon him to never return for aslong as the sword Blightslayer remains intact.

When the blade was finally broken by the trickster celestial Seh'Makou, Zalgo attacked Phoenixspire but was swiftly defeated by Gaia, Celestial of Light, sacrificing her life. It is said a relic was created out of the essences of both Zalgo and Gaia, but it has not been seen since.