Erec was born to the Unseelie King and an unknown faerie. Despite being one of fifty sons, Erec apparntly became his father's favorite. When he was young, Erec took pleasure in torturing his younger brother Kieran; his cruelty left Kieran with scars on his back and arms. At one point, Erec convinced his father to send Kieran, who had become a Court favorite, to the Wild Hunt.
In 2012, Erec relayed to his father the King that Kieran had killed Iarlath, a member of their Court, which resulted in Kieran being captured and sentenced to death. Erec took part in torturing his brother and delighted in binding him with thorns for his execution. When Julian Blackthorn and his family arrived to rescue Kieran, Erec was taken hostage by Julian as a way to escape the Court. He was outraged at the situation and threatened Julian during the entire ordeal until he was able to slip away while Julian was distracted.
Erec later followed Adaon when he answered Kieran's summons. He sneaked up on them and held a knife to the Shadowhunter Cristina Rosales' throat and later offered the knife to Kieran, telling him to kill her and prove his loyalty; he claimed that he would intercede on Kieran's behalf with their father in exchange. Kieran pretended to consider it, but rather than kill Cristina, Kieran sliced Erec's throat and killed him.
Though Adaon promised not to tell their father about what he'd done, the news still reached the King and enraged him enough to intercept a contact attempt from Kieran to Adaon and confronted him.
Erec was very cruel and sadistic. He delighted in hurting people and didn't exclude his family from his cruelty. Being the favorite of his father made Erec arrogant. He was also very loyal to his father and was ready to die for the sake of his Court.
Erec was pale, with black hair and a narrow, bearded face.
- Lord of Shadows (first and only appearance)