Kelâ€™Thuzad and the forming of the scourge
There were a handful of powerful individuals scattered throughout the world who heard the Lich Kingâ€™s mental summons from Northrend. Most notable of them was the archmage of Dalaran, Kelâ€™Thuzad, who was one of senior members of the Kirin Tor, Dalaranâ€™s ruling council. He had been considered a maverick for years due to his insistence on studying the forbidden arts of necromancy. Driven to learn all he could of the magical world and its shadowy wonders, he was frustrated by what he saw as his peersâ€™ outmoded and unimaginative precepts. Upon hearing the powerful summons from Northrend, the archmage bent all of his considerable will to communing with the mysterious voice. Convinced that the Kirin Tor was too squeamish to seize the power and knowledge inherent in the dark arts, he resigned himself to learn what he could from the immensely powerful Lich King.
Leaving behind his fortune and prestigious political standing, Kelâ€™Thuzad abandoned the ways of the Kirin Tor and left Dalaran forever. Prodded by the Lich Kingâ€™s persistent voice in his mind, he sold his vast holdings and stored away his fortunes. Traveling alone over many leagues of both land and sea, he finally reached the frozen shores of Northrend. Intent on reaching Icecrown and offering his services to the Lich King, the archmage passed through the ravaged, war-torn ruins of Azjol-Nerub. Kelâ€™Thuzad saw firsthand the scope and ferocity of Nerâ€™zhulâ€™s power. He began to realize that allying himself with the mysterious Lich King might be both wise and potentially fruitful.
After long months of trekking through the harsh arctic wastelands, Kelâ€™Thuzad finally reached the dark glacier of Icecrown. He boldly approached Nerâ€™zhulâ€™s dark citadel and was shocked when the undead guardsmen silently let him pass as though he was expected. Kelâ€™Thuzad descended deep into the cold earth and found his way down to the bottom of the glacier. There, in the endless cavern of ice and shadows, he prostrated himself before the Frozen Throne and offered his soul to the dark lord of the dead.