Aegaeon

Aegaeon was one of the four primary class pallasites. He is not a human. As a pallasite, his time control and another powers, depends of his weapon (sword) and with out it, the distortions made by him disappears.

Fight against Ikki
Aegeaon ever wanted to study the human, and meet Ikki, because he was following his leader (Saturn). Because the wish of Aegaeon to study the humans, he don't used all his power to fights with Ikki, to as far as he can do. Ikki sacrifices his body to damage the Aegaeon's sword (Jūbakuraizanba), forcing him heals himself in Cannon Island. So, he satisfied himself with the result of te text. The humans, can do madness.

Pallasbelda
Aegaeon followed Gallia and Hyperion and observed Titan care of Pallas; he is a Saturn servant (exactly why he helps Saturn against Ikki). He sent Surtr, his servant, to studies Shun, Kouga, Yuna and Souma (Surtr also want see this, but want kill them in the process), and Surtr was defeated. After, he sents Tokisada to kill Hyoga, Subaru, Eden and Haruto.

Shun arrives in Aegaeon's room, and him shows his Chronotector, and attacks with his sword, disabling Shun legs moves. He fights with Kouga, Yuna and Souma, and Kouga damages his sword, freeing Shun of the time freeze.

Ikki arrives to avenge on Aegaeon, and want discovery who is his true leader (he know that is not Pallas) and Aegaeon destroy his mind to Ikki don't read it. Ikki and Aegaeon, kill theirselves.