Callidora was the first female Exekian. Created by Akhen as a mate to Embal, the first male, she bore him a son, Monaxia. After the birth of her first child, she became convinced that she had been made unequal to Embal and began to resent him. After discovering she was pregnant again, she fled into the sea, where she was transformed into the first Fomori.
Her second son, Goran, was born at sea. Upon reaching adulthood, he returned to land in search of a mate. There he was reunited with his father, who begged Akhen to return Callidora to him as well. But Akhen refused, citing Callidora's freedom to choose where, who, and what she was, even knowing the pain and grief she caused by her actions.