Originally Posted by
Yingyang
I never said he did enslave him, but he was capable of doing so. He was fight with Yogg and his minions, he had one chained up that we actually let free, he was using Yoggs blood for Saronite, and his will over undead was stronger than Yoggs influence because the Scourge couldn't be controlled by him. Yogg did know that the LK could die, but even Arthas new that, he did his best to get rid of anythign he considered weak though, he purged Ner'zhul and even cut out his own heart to strength himself.
I am also sure that he was stronger than KJ or Arch. The whole reason KJ sent Illidan to stop Arthas when he did because he know if Arthas and Ner'zhul merged than he would be to strong to stop by normal means. Also The Legion doesn't have Necromancy powers. The Dreadlords do, which are the ones that crafted Frostmourne and the armor in the first place, but as we have seen Arthas has surpassed the Dreadlords before he even fused.
As for Deathwing, I am not sold he was stronger. He was the Earth Warder so of course he was able to rip the world a part some. But Arthas had an undead army so big that if Bovlar hadn't taken control of the helm the undead legions would have rampaged and destroyed the world anyways. Apples to oranges. As for something like a 1v1 fight between the 2, who is to say. Deathwing is massive, but Grom was able to take out Mannoroth who while, not as big as Deathwing, was still considerable bigger than his foe. With the help of Frostmourne, Arthas may have been able to use some spell to fight him. Deathwing is only an dragon aspect empowered by the Old Gods, As we saw in End Time, he was disposed of by the Old Gods once they got what they wanted from him. Deathwings true power comes from manipulating the Earth, his size can only help him so much in battle.