Aginor (AGH-ih-nohr), formerly known as Ishar Morrad Chuain, was one of the thirteen Forsaken who was trapped at Shayol Ghul due to the Dragon's sealing. Aginor was foremost in the creation of artificial constructs and created the Shadowspawn.
Aginor had a strong face and was as tall as Rand al'Thor.
Aginor was sealed very close to the surface and as a result time altered his features quite significantly. The skin of his face was like crazed parchment drawn tight over a skull, then pulled tighter still. Wispy tufts of brittle hair stood at odd places on his scabrous scalp. His ears were withered bits like scraps of ancient leather; his eyes sunken, peering out of his head as if from the ends of tunnels. 
Before turning to the Shadow, Ishar Chuain was a famous biologist. However, his desire for further experiments and discovery earned him a ban from genetic experimentation by the Hall of Servants. Acquiring more freedom to experiment under the Shadow, he created the Shadowspawn during the War of Power, but was never directly involved with military operations. It is believed that somewhere between 35 and 50 million people died in the experiments resulting in the Shadowspawn, at a rate of almost 10,000 per day from start to finish in the War of Power.
Among the Forsaken he was second in strength only to Ishamael and could match Lews Therin in the Hall of the Servants (or so he claimed). However, he appeared to be somewhat subservient to Demandred and admitted to being terrified of Ishamael.
Aginor and Balthamel were sealed near the surface of the Bore, and as such aged immensely by the time of their release. During his sleep of three thousand years, Aginor experienced endless nightmares. He and Balthamel were the first to be released.
Corlan Dashiva looked like a farmer from the Borderlands and appeared to be going insane due to the taint on saidin. He was very arrogant and very condescending towards Aes Sedai of this Age. He looked very plain and was in his middle years and had lank untrimmed hair.
Illian and the Seanchan Edit
When he and Aran'gar (Balthamel) were first resurrected, they were placed under the leadership of Shaidar Haran. Despite infiltrating Rand's Asha'man, Osan'gar still met with the remaining Forsaken and resented the fact the he had to play the part of Dashiva.
After the Battle of Dumai's Wells Dashiva was an Asha'man, chosen by Rand to be one of his bodyguards after being kidnapped by the White Tower Aes Sedai under Elaida do Avriny a'Roihan. He stood guard over Rand when he was meeting with some of the Aiel clan chiefs and when Cadsuane Melaidhrin arrived and insulted Rand.
He was one of Rand's bodyguards when he met with the Sea Folk and made the Bargain. Surprisingly Dashiva seemed concerned when Rand was near death due to being stabbed with the Shadar Logoth dagger. He brought in Damer Flinn to Heal Rand. It was Dashiva's idea for Flinn to start exploring his ability in Healing. He Traveled to Illian with Rand in order to confuse Sammael and try to bring him back to the city of Illian so Rand could finally defeat him.
He went with Rand when Rand tried to deal with the Illian rebels loyal to Lord Brend. He rode with Rand when Rand's forces attacked the invading Seanchan just outside Illian. He tried to warn Rand about saidin not behaving properly around Ebou Dar. On arrival back to Cairhien he accompanied Rand to a meeting with Cadsuane. He used several weaves Rand had never seen before to try to intimidate Cadsuane. Dashiva and several other rogue Asha'man, who turned out to be Darkfriends, attempted to kill Rand and flee, and Rand then followed to try to kill the would-be assassins.
Last seen during the Battle near Shadar Logoth, Osan'gar was seen and attacked by Elza, who assumed she was killing Dashiva. Osan'gar's body was not seen and the attack not specified as balefire, so it could have been possible for the Dark One to again resurrect his soul into another new body, but he chose not to exercise this option. One of Egwene al'Vere's visions suggests that he does not return.
Aginor's name may be derived from Agenor of Greek mythology (the father of Europa and the founder of the city of Thebes).