"The dragon Nightbane. Once called "Arcanagos", uncontrolled magic warped his mind." - The Curator[1]
Once a powerful member of the blue dragonflight, the dragon Nightbane has somehow ended up as an exhibit in Medivh's menagerie. After being released by the deranged Curator, the player will have to defeat Nightbane in order to progress to the tower's next level.
Arcanagos was a powerful blue dragon who traveled to Karazhan back during/prior to the First War to warn Medivh and the surrounding village that something dark and sinister was happening in the area of the tower. He sensed Medivh was being used by a dark and sinister force. Arcanagos pleaded with Medivh to abandon the tower before the situation escalated out of control. When Medivh refused to leave his residence, the blue dragon attempted to remove him by force. The two masters of the arcane fought briefly, trading blows, but the blue wyrm met his match in the corrupted Titan-imbued Guardian of Tirisfal. Burning from a horrific spell from the inside out, Arcanagos frantically flew off and crashed into the mountains of Deadwind Pass, dying a painful death, his bones shattering and falling down to scatter the surrounding area.
The spell Medivh used against the dragon imparted some of his own essence into Arcanagos. In order to divine information about Medivh, the Violet Eye has adventurers resurrect the dead dragon in order extract the arcane essence. Arcanagos appears, now as a fiery skeletal monstrosity known as Nightbane, and proceeds to attack those who summon him.
Nightbane is a summonable raid boss in Karazhan. He is a fiery skeletal dragon, transformed by Medivh from Arcanagos and formerly of the blue dragonflight. While not the ruler of Karazhan, a position apparently held by Prince Malchezaar, many consider Nightbane to be the true final boss of the tower, due to his superior difficulty in the early days of the raid's release.
Nightbane has two phases that he transitions between several times during the course of the fight. During the Ground Phase, tank the boss on the ground in a style reminiscent of Onyxia. At 75%, 50%, and 25% health, he enters the Flight Phase and takes to the sky, during which time the raid's attention is focused elsewhere. After Nightbane finishes casting Rain of Bones and then Smoking Blast he begins a slow descent back down to the platform (to roughly the same location as the original landing) and Phase One begins anew. He is NOT tauntable.
This section uses content from the Warcraft Wiki.
Claw
Dragon's Breath
Flame Lance
Giant Sand Worm
Book Wyrm
Reincarnate
Lantern of Power.
Unstable Portal
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This section uses content from the Warcraft Wiki.
Medivh and the surrounding village that something dark and sinister was happening in the area of the tower. He sensed Medivh was being used by a dark and sinister force. Arcanagos pleaded with Medivh to abandon the tower before the situation escalated out of control. When Medivh refused to leave his residence, the blue dragon attempted to remove him by force. The two masters of the arcane fought briefly, trading blows, but the blue wyrm met his match in the corrupted Titan-imbued Guardian of Tirisfal. Burning from a horrific spell from the inside out, Arcanagos frantically flew off and crashed into the mountains of Deadwind Pass, dying a painful death, his bones shattering and falling down to scatter the surrounding area.
Patch 6.0.0.13921 (2016-08-09):