Ostus Agrivar Ostus Agrivar was a male human wizard of the North . He was one of the most renowned wizards of the region and lord of the Agrivar estate . Relationships . Ostus was head of the Agrivar family . He had one son , the paladin knight Priam Agrivar , whom he groomed to be the next Lord Agrivar . He also had a daughter , Cybriana , with a drow sorceress from Shadowdale . Cybriana and her dark half Kilili ultimately merged into Kyriani Agrivar , a new daughter of Ostus . Possessions . Ostus had a holy trust , as keeper and guardian of " Selûne ' s Eye " . He was the lord of the Agrivar family estate on Mount Sar , including the family home called Ostus ' s Hold . Description . As a young man , Ostus had shoulder - length dark grey hair . He wore a black tunic with a golden collar . As an old mage , Ostus had shoulder - length white hair and a long white mustache . He wore ornate robes and " Selûne ' s Eye " around his neck . History . Youth . Ostus Agrivar ' s past was a part of legend , set down in the Song of Selûne . The story knew him as a young wizard , riding a horse when he heard the cries of a young woman — the goddess Selûne , tricked and menaced by the monstrous extraplanar conqueror Imgig Zu . Bravely , he raced to her rescue , hurling a spell at Imgig . Although he was not powerful enough to defeat the monsters , he was able to cause enough confusion and chaos that Selûne could escape , climbing onto his horse . To defeat the creatures , the goddess drained her life force away and imprisoned the monsters inside a pocket dimension within a gigantic moonstone , which should contain them for all time . She reduced the gem , now known as " Selûne ' s Eye " , in size and gave it to Ostus for safe keeping . He never knew that Selûne had sacrificed her youth to do so . The story diverged at this point . In some versions , Selûne went back to her home , and brought the young mage with her . Others told that the young mage loved her , but she rejected his advances because she was no longer young or beautiful . Later , whilst still a young mage , Ostus was apparently foraging for components for cures and potions near Shadowdale when he ' d met and been seduced by a " wicked " woman , in fact , a drow sorceress of the region . A child was born of this tryst , Cybriana . Shortly after her birth , her mother took her to an elf village in Shadowdale and abandoned her , leaving her in the care of an elderly elven woman . Cybriana ' s mother departed , teleporting away by some magic . This was all Cybriana knew of her heritage ; she did not know her father ' s name for many years , and knew only that he wore a gem called " Selûne ' s Eye " . Cybriana was a typical half - elf baby , marred only by a strange dark birthmark that developed into a horrid growth , one that bore an evil face . It was thought to be a manifestation of the mother ' s evil . As the growth threatened to kill her , the village council performed a shamanic rite to extract the dark spirit . Young Cybriana was cured and freed , but the dark spirit escaped . The dark spirit transformed into a drow woman who called herself Kilili . Meanwhile , the monstrous Imgig Zu , still trapped within " Selûne ' s Eye " , observed all this and forged a magical link with Kilili , allowing him to escape into the Realms . However , he needed Cybriana and Kilili together to release the rest of his people . Kilili fell in with Imgig , and together they hatched their scheme . Lordship . Later , Ostus became the lord of the Agrivar estate , north of Waterdeep , housed in Ostus ' s Hold . He also had another child , Priam , who became a paladin . Father and son performed many services for Lord Nasaqh of the neighboring Nasaqh Estates , for which Nasaqh was quite grateful . Ostus Agrivar became one of the most renowned and well - respected mages of the North , and was recognized for his great goodness . At one point , Ostus worked with the mage Parwyyd Hanifar , exploring the frontiers of magic together . They built the Great Door on the outskirts of Waterdeep , in order to easily enter the planes . Each wizard needed the other to control the Door . By the early 1350s DR , Ostus said he had retired from active magic use , bar occasionally speaking with elemental s . He wished to prepare his son to succeed him as Lord Agrivar , though Priam was not done adventuring . However , Imgig Zu had finally caught up with Ostus . In the Year of the Dragon , 1352 DR , riding a wyvern , Imgig broke through the wall and magical defenses of Ostus ' s Hold and attacked father and son . Priam was crippled by Zu ' s " staff of withering " and Ostus slain by his death spell . The attacker seized the " Selûne ' s Eye " and left . Agrivar buried Ostus in the family crypt , then ventured out in search of his killer . Legacy . Retribution was to be a long time coming . Crippled , ashamed for failing to save his father , Priam fell into a deep depression and drunkenness . Some six years later , in the Year of the Prince , 1357 DR , he ' d wandered into Waterdeep and was reduced to begging on the streets . This was how Cybriana found him , somehow knowing she had to seek out the paladin Agrivar , though not knowing him to be her brother . As she related her tale , a recovering Priam realized they shared a father . Finally , as Imgig Zu ' s plot came together , brother and sister confronted him . Imgig taunted Priam and threatened to kill him as he had killed Ostus Agrivar . But , ultimately , Priam struck and slew Imgig Zu in the name of their father . Cybriana and Kilili touched and merged into one being , the living key to " Selûne ' s Eye " . The merged being vanished inside the gem , drawing all of Imgig ' s people back within , saving the Realms from devastation at the cost of her unique identity . A merged being levitated down , passing the shrunken " Selûne ' s Eye " to Priam . Part Cybriana and part Kilili , she combined their names and named herself " Kyriani Agrivar " , a new daughter of Ostus Agrivar . Later that year , the Great Door had somehow opened on its own , and Parwyyd sought one with " the blood of Agrivar " , who also bore his magic aura , to help him close it . He used a false image of Priam to lure Kyriani to the Door , and enlisted her aid , but felt that the merger of Cybriana and Kilili had been incomplete . In the ensuring battle , Kyriani was separated into the two women again . However , it was Kilili who retained Ostus ' s aura . Parwyyd surmised that Kilili , the evil spirit she had been , and the strange growth on Cybriana she had emerged from , was the product of the evil of " both " her parents . Even a man as goodhearted as Ostus had had a dark side , one that all humankind possessed . Ultimately , Cybriana accepted her own dark side and re - merged with Kilili , producing a new and more whole Kyriani , one who could make her own destiny .