You can find The Shattered Halls dungeon within Hellfire Peninsula, Outland.
The coordinates are (47.9,51.5)
1. Grand Warlock Nethekurse
/i Death Coil damages & causes a player to run in horror, also heals boss for damage caused. Lesser Shadow Fissure (red circle & pink lines) appear under a player inflicting damage, move away. Spins at 25% dealing more shadow damage.
2. Blood Guard Porung (Heroic Boss)
/i Uses Cleave inflicting physical damage to a player & all nearby.
3. Warbringer O’mrogg
/i Thunderclap hits all nearby reducing attack speed & movement. Fears all nearby players. Burning Maul deals extra fire damage with his melee. Blast Wave hits all nearby reducing movement speed.
4. Warchief Kargath Bladefist
/i Blade Dance charges random players & also hits others nearby. Guards will inflict physical damage to players, kill them quickly.
Heroic Differences: Uses Charge on a random player damaging & stunning for 2 sec.