It was already three days later when they returned from Azeroth to Draenor.
Accompanied by Dick, Sinestra first traveled to Highmountain in the Broken Isles to meet Blackhorn, who had taken the guise of a Highmountain Tauren elder. The two black dragons untainted by chaos talked privately all night. The next day, Blackhorn, elder of the Highmountain Tauren, suddenly fell ill and died that evening despite treatment, at the age of 9,845.
Next, the Dragon Mother took Blackhorn, now restored to his true identity, to Northshire in Stormwind City to see her daughter Onyxia. Reportedly, King Varian Wrynn of Stormwind City accompanied them throughout. The Dragon Mother did not forcefully demand that Stormwind City's royal family remove Onyxia's shackles, but she ultimately reached some secret agreement with Varian. It was said that she offered the service of three black dragons to Stormwind City for 200 years after the Black Dragonflight was rebuilt, in exchange for Onyxia's freedom.
Varian clearly knew how to bargain over such matters. He rejected the 200-year clause and reached another agreement with the dragoness instead: as long as House Wrynn endured, the Black Dragonflight would have to send an adult dragon to serve as a "royal family advisor." This effectively bound Stormwind City's royal family and the Black Dragonflight together.
Although there was still little hope of rebuilding the Black Dragonflight, Varian trusted Dick and was ready to remove Onyxia's seal on the spot. The Dragon Mother stopped him, however.
Dick was quite right. Until Deathwing, the source of the black dragons' corruption, was dead, even she could not guarantee whether Onyxia was in a normal state. Meanwhile, the willful, spoiled Black Dragon Princess was exceptionally obedient before her mother. Her father brought her only fear, while her mother gave her a true sense of security.