You can find Blackrock Caverns dungeon within Blackrock Mountain.
The coordinates are (70.6,52.9)
You can take a shortcut to 1st boss by running down the left side, the path is broken so you can sneak down instead of going all the way round.
Make sure that you don’t have any players in your group with a pet out as they will run all the way round and aggro what you are trying to skip.
/i Quake damages players then the cracks will erupt after 3 secs, move away. Chains of Woe pull players closer to boss, attack the chains to free yourself. Keep at least 12 yards away from boss when casts The Skullcracker (will cast after Chains of Woe).
Heroic Differences: When casts Quake also summons Angered Earth creatures from the cracks.
2. Corla, Herald of Twilight
/i Avoid standing in the beam between a Twilight Zealot & the Nether Dragon corpse. Interrupt Dark Command. Interrupt Twilight Zealots. If they are Kneeling in Supplication don’t attack. Evolved Twilight Zealot deal lots of damage.
3. Karsh Steelbender
/i Superheated Quicksilver Armor: his damage taken increases by 5%, attack boss from ranged to avoid Heat Wave, healer keep tank topped up. When he cools off Quicksilver Armor reduces damage taken by 99%, avoid the Lava Spouts that erupt from the grates.
/i Charges at furthest player inflicting physical damage & knocks back. Flamebreak inflicts fire damage to all nearby & knocks back. Fears all nearby. Magma Spit deals lots of fire damage, avoid magma blobs that land. Pups channel Flame Breath at target.
Heroic Differences: Lucky, Spot & Buster are Beautys pups, if you attack any Beauty will also attack you. Avoid standing in the pups Lava Drool. Pups channel a Flame Breath at their target.
5. Ascendant Lord Obsidius
/i At 69% & 34% boss switches place with a Shadow of Obsidius (they absorb all damage). Stone Blow inflicts high damage & stuns current target. Twilight Corruption inflicts ticking shadow damage to a player.
Heroic Differences: Uses Thunderclap which slams the ground inflicting nature damage & reduces movement speed of all nearby by 50%.