Polarch Zadras

"At the end of all things, the world shall be baptized in red, as my lord Angra rises to greet the fallen sun." 
-Polarch 
Polarch Zadras, also known as the Hand of Angra or the Dead-Mouthed Singer, is a prophet of Angra the Betrayer, and his favored representative in the Cosmos reality. A kesher demon, Polarch is the last living member of the House of Vaan, having singehandedly slaughtered the rest himself, at the behest of Angra. 
Polarch was born in the city Ulug-abra sometime during the early 11th era as a bastard son to Gelet Vaan, the third son of the demon lord of House Vaan. Oft bullied throughout his childhood, he ran away at the age of fourteen, before being found by Lionel Zadras, an archangel from the Aether Kingdom. From that point on, he was raised as the younger brother to Leonarch Zadras as part of a nature-vs-nurture experiment. Though he had been happy during that time, he always felt a hidden anger toward how his true family had treated him. 
During his coming-of-age ceremony at the age of twenty, he would use his newfound freedom to return home to Kondrakis to confront his family. The confrontation ended in violence, with him killing his brother and stepmother in a fit of fury that was witnessed by Lionel Zadras. Disappointed and heartbroken, Lionel brought Polarch back to the Aether Kingdom to stand trial, during which Polarch passionately defended his actions, recalling Aetherian laws of family, revenge, self-defense, and the pursuit of righteousness. However, the court found him guilty regardless, and used those same laws to condemn him to death, under the crime of being a demon. 
As he awaited his execution, he suffered a psychotic break, in which he cursed the courts, his family, and the entire angel race. His howls were so fueled by rage and despair at the betrayal he had suffered, that his pain reached the ears of Angra. It was then that Polarch would meet his north star, his guiding light in the darkness... or rather his darkness in the light. Angra promised him everything he had been denied, revenge, power, and a world to endlessly sink into pain, as he had been. Polarch, enraptured by the Red Emperor's whispers, accepted his power, and broke out of prison. As Angra's newest champion, he would slaughter his way through Aetherian upper class, silently slitting their throats in the night before he was confronted by Leonarch and his father. Despite both their positions as Archangels, they were no match for Polarch, and drunk on power, he butchered Lionel, and left Leonarch severely wounded. From there, he would descend the heavens to wreak havoc upon the Vaan Clan, slaughtering the entire city of Ulug-abra, down to the last child. 
Polarch would spend many years wandering the world, gleefully doing Angra's bidding as he fell further and further into Red Emperor's whispers. Eventually, he would come face-to-face with Leonarch once again, sometime during the middle of E11. Leonarch, now a champion of Angra's archenemy Varastas, successfully used his power to defeat Polarch in single combat, stripping him of much of his power. However, overcome with weakness for his former brother, he let him go under the terms that he would abandon Angra, and find redemption. 
Polarch, though now free of Angra's power, decided to return to him anyways. However, Angra was disappointed in him for losing to Leonarch, and refused to accept him as champion. Despite that, Polarch's continued reverence of him led Angra into appointing him to a new role, that of prophet. Polarch would continue on as Angra's servant, now acting from the shadows to do his master's bidding. 
It is known that at one point during the late 11th Era, Polarch would aid a group of adventurers in traveling to Arrowmight, and act as their guide into resolving the mystery behind the Kara Plague that had gripped the Kondrakis Continent. Leonarch would also come to learn of Polarch's presence at one point, the former Varastas champion -stripped of his power for granting Polarch clemency- would hunt him down. However, he would never be able to capture his brother. 
Later, Polarch would also have a hand in the War of the Arrow,. Then following the Convergence, Polarch would become Angra's chief representative on Earth, having a hand in a variety of terrorist groups and incidents. Some of these include the burning of Washington D.C. during the Washington Catastrophe, and the attempted kidnapping of Raihan Zoraskaya, which would lead to the destruction of a hospital in Moscow. 
Now, he aids the Royal Eclipse Syndicate in Geteye Ndung'u's goal in mantling Angra. As to why is still unclear.