Dead Men Walking

Bony Construct
Melee Chain Cleave - Strikes enemies in front of the Construct, chaining to anyone in melee range of the targets. This can chain out of melee range of the original target, if it keeps going.
Knockback - These mobs seem to have a knockback effect
Vulnerable to stuns or Shackle Undead. Break apart the pulls into ones and twos, tank and kill.
 
Dark Touched Warrior
Aggro Wipe - These humanoids appear to wipe aggro every few seconds, much like Battleguard Sartura.
 
Death Lord
Aura of Agony: (Similar to Deathknight Cavalier but stacks about 10times faster)
Frontal Cleave - Melee strike against all enemies in front of them.
Death Coil - Fears one opponent and sends them running for 3 seconds. During that time, it drains life from the opponent.
Kill me first!
 
 
Deathknight
Raise Dead - A deathknight will animate any slain humanoid or undead companion into a skeleton called Deathchill Servant, save another deathknight, in an effort to overwhelm your raid group.
Deathknights will randomly use AE fear and will then target the person highest on their threat list who isn't feared.
Split up far from other mobs.
 
 
Deathknight Captain
Whirlwind - Deathknight Captains will occasionally use a whirlwind attack that hits for high damage. The attack will also periodically knockdown those it hits. The captain may move while he does this, so stay on your toes.
Can be disarmed.
Split and burn down.
Charge/Intercept - He rarely does this.
 
 
Deathknight Cavalier
Aura of Agony - Area effect stackable damage over time. This DoT does shadow damage to everyone within 30 yards and stacks an infinite amount of times. Does 120 damage per stack. Split and kill quickly.
360 Cleave - Melee strike against all enemies around them.
Death Coil - Fears one opponent and sends them running for 3 seconds. During that time, it drains life from the opponent.
 
 
Doom Touched Warrior
Aggro Wipe - These humanoids appear to wipe aggro every few seconds, much like Battleguard Sartura.
 
 
Necro Knight
Each one picks a random school of magic, when aggro'd, Based upon which one they choose they have a different ability

• Blast Wave - Fire (~ 2k)
• Flame Strike - Fire (~ 1500 + 700 DoT)
• Frost Nova - Frost
• Arcane Explosion (Very Large Range) - Arcane

They CAN Reselect their tree in the middle of a fight.
 

Risen Deathknight
seem to reset aggro every few seconds
vulnerable to snares
not vulnerable to stuns or shackle
 
 
Shade of Naxxramas
Shadowbolt Volley
Summons Ghost of Naxxramases though red portals while they are alive and aggroed.
Summons one Ghost of Naxxramases on death.
Ghost of Naxxramas is non-targetable and can not be attacked, just get away from them.
 
 
Skeletal Smith
Thunderclap
Disarms & can be disarmed
 
Skeletal Steed
Trample - Area Effect physical damage to anyone in melee range. This attack goes off quite frequently and does about 1500 damage to plate.
Intercept - Has an intercept similar to the Warriors intercept, doing minor damage and stunning.
 
 
Unholy "Weapon"
Swords:
A giant frontal cleave and whirlwind that hits mail armor for ~2200. The cleave has a large depth to it (was hitting people far behind the warrior tanking it). They also will use sweeping strikes, which hit for melee damage as well. (Roughly 2200 on mail as well)
 
Staves:
Arcane explosion (roughly 25 yard radius), hits for roughly 2200. They also sheep a random member of the raid (possibly the closest non tanking target.
 
Tank facing away from raid.