Mithysilsa Anarell was a unique existence.
His origins were mysterious, but his name alone made it clear that this child, in his teens at most, was connected to Arthas Menethil, the Lich King who had been gone for years. All the more so because he carried a longsword reforged from Frostmourne, the runeblade Dick had once severed.
Yet few people in Azeroth knew this child existed. In fact, when Arthas experienced his final resurgence, he had planted the seed of his power inside Anarell. The child had stayed in Azeroth for fewer than fifteen days before following Uther to the Shattered World of Draenor.
Dick was not heartless. Before Anarell left, he had let him meet his elder sister, Caliea Menethil, Queen of Lordaeron. The reunion between brother and sister had been particularly moving, especially since Anarell's memories had largely stopped at the age of ten. Those had been the warmest days Caliea and Arthas had spent together. The Orcish War had only just begun to show signs of brewing, Lordaeron had still been a peaceful, prosperous kingdom, and everything had still been beautiful.
But Anarell's fate was bound to be turbulent. No one believed a child wielding a runeblade would grow into an ordinary man. Under Uther's guidance, Anarell swiftly displayed a talent that was both astonishing and chilling. Even without using the Helm of Domination, he could control an immense number of undead, as though the child had been born to command death.
Whenever a crisis arose and he took the Helm of Domination from Uther, his control could even rival the Lich King's at his peak. He was practically a terrifying, humanoid scourge. This was also why Dick had allowed Uther to take Anarell alone to the Mac'Aree Ruins... this child was an army all by himself!