"He was Kaidon of Hidal Keep, and hated humans with an unmatched passion. He is a mighty warrior, as strong as he is cunning. To put it another way: if he and I had both fallen out of favor with the Prophets on the same day, he would be the one wearing this armor."
Atsu 'Hidal rose quickly through the ranks during the human Covenant War, eventually becoming a Field Master. He led many successful campaigns against the humans, and was a real cause for concern.
He was known to be extremely smart on the field of battle, often seeing weaknesses in an enemy that many would not have seen. He is also skilled with an energy sword, his two strongest traits combining to make a formidable opponent in combat.
Atsu was assumed to have died some time before 2559, as his position of leader was replaced by Isto 'Vadum.