Shackles the target undead enemy for up to X sec. The shackled unit is unable to move, attack or cast spells. Any damage caused will release the target. Only one target can be shackled at a time.
Shackles the target undead enemy for up to X sec. The shackled unit is unable to move, attack or cast spells. Any damage caused will release the target. Only one target can be shackled at a time.
Shackle Undead is a priest ability, first learned at level 20. It will shackle an undead enemy, making it unable to move or attack for the duration of the spell, and the creature will be visibly enclosed within chains.
It does not work against Forsaken players, because they are classified as Humanoid and not Undead.
It can however be used against Death Knights under the effect of Lichborne, as well as their ghouls.
The spell is used to remove an enemy from combat when attacked by multiple enemies, giving you time to kill off some of the other enemies. As such, this spell is a form of crowd control.
Shackle Undead interrupts any spells being cast when it lands, so it can also be used as an interrupt even if it is immediately broken by damage.
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Patch 3.0.2 (2008-10-14): Mana cost changed to 9% of base mana in stead of 150 flat mana. 
