Blackwing Descent

Nefarian and his warped attempts to create a new breed of dragon were thought to be defeated after his death in Blackwing Lair. Yet tales have emerged that his father, Deathwing, has reanimated Nefarian and set him to work in Blackwing Descent. The gruesome experiments being conducted there are feared to be on a level of wickedness far surpassing Nefarian's previous crimes against nature.

Bosses: 6 bosses
Mythic+ timer: No timer

Bosses

Omnotron Defense System
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
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
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
Terrifying. Ugly. Evil. Kill it.
Maloriak
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
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.

Boss by boss

Omnotron Defense System

Magmatron
Arcanotron
Electron
Poison Bomb

The four dwarven golems share a health pool and two are active at any given time. When a golem activates, it possesses 100 energy to use for its abilities. Once the golem's energy reaches 50, it gains a defensive shield and a new golem activates. Once the golem's energy reaches 0, the golem deactivates and another golem activates.

Abilities

Power Generator
Arcane Annihilator
Power Conversion
Converted Power
Overcharged Power Generator
Arcane Blowback
Lightning Conductor
Electrical Discharge
Unstable Shield
Shadow Infusion
Incineration Security Measure
Acquiring Target
Flamethrower
Encasing Shadows
Barrier
Chemical Bomb

Magmaw

Magmaw
Lava Parasite
Lord Victor Nefarius
Blazing Bone Construct

Magmaw spits a volley of magma at three random players, inflicting 0 Fire damage to each player.

Abilities

Pillar of Flame
Parasitic Infection
Lava Spew
Molten Tantrum
Mangle
Sweltering Armor
Massive Crash
Lava Worm Wrangling
Launch Hook
Point of Vulnerability
Blazing Inferno
Ignition
Fiery Slash
Armageddon
Shadow Breath

Atramedes

Atramedes
Obnoxious Fiend

Atramedes is blind and hunts based on sound. Players begin the battle with 0 Sound and gain Sound when taking damage. Atramedes channels Devastation on targets with 100 Sound and quickly kills them. Using an Ancient Dwarven Shield resets the Sound on all players.

Abilities

Ancient Dwarven Shields
Resonating Clash
Vertigo
Grounded Abilities
Sonar Pulse
Modulation
Sonic Breath
Searing Flames
Roaring Flames
Devastation
Airborne Abilities
Roaring Flame Breath
Sonar Bomb
Sonic Fireball
Phase Shift
Obnoxious

Chimaeron

Pip Quickwit, gnome explorer extraordinare, has been captured by Nefarian and cannot be freed from his cage until Chimaeron is slain. A player can talk to Pip before the fight begins to convince him to activate his Bile-O-Tron, which helps keep the raid alive. Activating the Bile-O-Tron also wakes Chimaeron.

Bile-O-Tron: When Pip activates the Bile-O-Tron, it moves about the room and sprays raid members with Pip's Mixture as long as it is active. Chimaeron periodically knocks the Bile-O-Tron offline.

Abilities

Stage One: Truly Something to Behold
Caustic Slime
Massacre
Feud
Break
Double Attack
Stage Two: A Horrific Creation
Mortality
Mocking Shadows

Maloriak

Maloriak
Prime Subject

Periodically, Maloriak throws various vials into his cauldron, causing different effects. The first two Vials will be Red then Blue or Blue then Red, followed by Green, then the cycle repeats.

Arcane Storm: Maloriak channels an Arcane Storm inflicting 0 Arcane damage per second for 6 sec. to all players.
Remedy: Maloriak heals himself for 0 health and generates 0 mana per second for 10 sec. The amount healed increases by 0 per second.
Red Vial: Maloriak throws a Red Vial into his cauldron, giving him flaming breath. The effects of the Red Vial last for 40 seconds.
Blue Vial: Maloriak throws a Blue Vial into his cauldron, granting him freezing magic. The effects of the Blue Vial last for 40 seconds.
Green Vial: Maloriak throws a Green Vial into his cauldron. The mixture explodes and cancels the Growth Catalyst on the Aberrations. The effects of the Green Vial last for 40 seconds.
Dark Magic: Lord Victor Nefarius throws Dark Magic into the cauldron, causing Vile Swill to spew from the cauldron. The effects of the Dark Magic last for 90 seconds. The Dark Magic also grants Maloriak immunity to Taunt effects.

Abilities

Stage Two: Unpredictable Results
Release All
Magma Jets
Absolute Zero
Acid Nova
Growth Catalyst

Nefarian's End

Nefarian
Onyxia
Animated Bone Warriors
Chromatic Prototype

Throughout the battle, Nefarian electrocutes the entire raid every time he loses 10% of his health. Electrocute generates a massive crackle of lightning that inflicts 0 Nature damage on all players.

Abilities

Stage One: Rise, Sister!
Children of Deathwing
Hail of Bones
Shadowflame Breath
Tail Lash
Empowering Strikes
Dominion
Siphon Power
Stolen Power
Free Your Mind
Electrical Energy
Lightning Discharge
Electrical Overload
Stage Two: Curse You, Mortals!
Blast Nova
Shadowflame Barrage

Loot

BossClassSlot

What each boss can drop. With a class chosen, only what it can use (by armor type or because the item is for that class). Drop chances aren't published.