Prince Yriel

Prince Yriel, Autarch of Iyanden, was a brilliant if reckless commander in Iyanden's fleet. He is not of pure Iyanden blood but is honored as one of the greatest defenders of Iyanden. He was originally exiled when he led a successful and pre-emptive attack on a Chaos fleet that left the Craftworld open to attack. He and his crew formed a corsair fleet, the Eldritch Raiders, and had become infamous throughout the galaxy in only a few decades, a testament to Yriel's skill.

He and his fleet saved Iyanden at its time of greatest need, at the height of the Tyranid invasion by the Hive Fleet Kraken. As the Craftworld was about to fall, Yriel and his Eldritch Raiders blew a sizeable hole in the Tyranid's fleet and reinforced Iyanden's forces. Yriel himself slew the leader of the hordes, a supposedly invincible creature, with the Spear of Twilight, a cursed artifact that contains the power of a Supernova. Yriel was then instated as an Autarch of Iyanden, and is currently searching for a way to rid himself of the Spear, which is slowly killing him.

Yriel first appeared in early first edition as the "self-styled 'Lord Prince Yriel,'" where it is mentioned that Imperium fostered rivalries between Yriel and other pirate companies resulted in factional fighting; his conquest and absorption of two of these rival groups (Xian's Black Raiders and the Scarlet Command) making him the single most powerful Eldar pirate operating in the galaxy.

The Spear of Twilight
The Spear of Twilight was a legendary artifact of kept in the Shrine of Ulthanash in the Craftworld Iyaden. The weapon was "so powerful it would burn the bearer's soul". The spear, unlike other weapons, could not be removed by the owner and thus Yriel, when he used the powerful spear to kill the leader of the Hive Fleet Kraken, was bound by its curse.

The spear's curse operates by draining Yriel's energy, which is represented by him taking a wound at the end of each battle he fights in. The spear is a singing spear, the psychic weapons used by Eldar Warlocks, and each wound is able to ignore the armour and invulnerable saves of its enemies.