The Dark Dimension was, in essence, a barren and silent Dimensional Space. It existed in a form humans could not observe, until Dormammu discovered it—back then, he did not yet bear that name. He was merely an obscure witcher from ancient times.
The era Dormammu lived in was a barbaric age when magic was in decline. Mages were regarded as evil heretics and servants of the devil, unrecognized by the Church. Worse still, they were misunderstood and hated by the public, who believed they desecrated the corpses of the dead, controlled terrifying undead, and were unforgivable blasphemers!
Thus, the Middle Ages saw sweeping witch trials and witch hunts. This vile tide swept across Europe for nearly three hundred years, becoming one of the darkest chapters in the history of human civilization.
It was not until Agamotto emerged out of nowhere, inherited Kamar-Taj, the ancient holy land, communed alone with the trinity of Vishanti, and formed an equal contract with them, establishing a complete system of mages, that the inheritance of magic was preserved.
Had Dormammu been born in that era, perhaps he would not have become the later Dark Lord. Unfortunately, fate was so strange. As an obscure witcher, Dormammu was never welcomed. One day, while attempting to commune with the gods he worshipped, he happened upon the existence of the Dark Dimension.
Dormammu, who practiced Black Magic and was a necromancer, did not hesitate for long before making the momentous decision to abandon his human form. He entered the Dark Dimension as a soul and gradually became incomparably powerful as he continuously absorbed its strength.
Over the long years, Dormammu forgot his human name. After merging with the Dark Dimension, its dark power gradually assimilated his will. This ruler began his evil journey of conquering countless dimensions. By then,