The Shattered Halls are the third and most difficult of the five man instances in the Hellfire Citadel. The citadel itself straddles the Path of Glory leading to the Dark Portal and contains 3 other instances. The Citadel is the home of the Fel Orcs in Hellfire Peninsula and was built by Blackhand and Guldan and still houses the Kargath Bladefist.
Shattered Hall Legionnaires - These MOBs are in charge of each of the large groups in the Shattered Halls. They are melee fighters and generally have 4-6 other MOBs with them. They MUST die first, as their ability is to call in replacements for any MOB that dies while they are still alive. No one should jump to any other target until the Legionnaire is down.
You can check out the whole guide here: TenTonHammer's Guide to the Shattered Halls
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