Blackwing Descent is an entry-level level 85 raid instance. Having retreated further into Blackrock Mountainfollowing his defeat in Blackwing Lair, Nefarian has been bolstering his forces here and must be stopped once more. The entrance to the instance is near Nefarian's throne in the uninstanced portion of Blackwing Lair and is accessible by flying mount only.
Blackwing Descent, along with Bastion of Twilight and Throne of the Four Winds, is one of the first raid instances in World of Warcraft: Cataclysm and its place in the expansion is intended to be akin to that of Naxxramas in Wrath of the Lich King.
Blackrock Mountain [25, 23]
Nefarian and Onyxia
Intro on walking beyond entrance
Lord Victor Nefarius yells: Welcome to my personal sanctum, heroes! I hope you find the accommodations to your liking. Herein you will find many of my failed experiments and ultimately my greatest triumph!
Lord Victor Nefarius yells: Mortals that fancy themselves HEROES have entered the Broken Hall! Oh, I do hope this 'raid' will amuse me more than the last!
The instance consists of two subzones, the Broken Hall and the Vault of the Shadowflame. When you enter the instance, the Omnotron Defense System will be off to your right with Magmaw off to your left. There is no required order, but Magmaw is usually considered the "first" boss. You next descend into the Vault, where Nefarian's experiments take place.
The Vault branches off into three areas where Chimaeron, Atramedes and Maloriak can be found. Only after defeating all of them will Nefarian himself become available, standing in the middle of the Vault as Lord Victor Nefarius.
Omnotron Defense System ¨C The Omnotron Defense System was once touted as the Dark Iron dwarves' greatest technological marvel. When Nefarian arrived in Blackwing Descent, he repurposed the run-down system to annihilate anyone intruding on his laboratories.
Magmaw ¨C Magmaw is a colossal lava worm summoned from the Firelands centuries ago by Ragnaros' Dark Iron servitors. Nefarian largely considers Magmaw a worrisome pest, but has grown fond of feeding the beast his failed experiments... and servants.
Atramedes ¨C Atramedes, or Experiment 25463-D, is a failed attempt to bestow enhanced senses on a black dragon whelp. The toxic salve applied to the broodling robbed him of sight, forcing him to rely on sound and smell for survival. A tragic story... if Atramedes weren't so evil.
Chimaeron ¨C Terrifying. Ugly. Evil. Kill it.
Maloriak ¨C The human Malory was a bright young alchemist until he was kidnapped by Nefarian and fused with the corpse of a dragonspawn. The result-Maloriak-is a bumbling minion who possesses only a dull glimmer of his former intelligence.
Nefarian's End ¨C Deathwing's son, Nefarian, gained infamy for his horrifying efforts to create chromatic dragons from the essences of Azeroth's various dragonflights. After his death in Blackwing Lair, he was reanimated and charged by Deathwing to continue his insidious endeavors.