http://wowwiki.wikia.com/wiki/Army_of_the_Dead
Level ?? bosses are immune to the taunt effect, but that does not mean that all mobs at least three levels higher than you will be, so do not make that mistake. For example, adds on the Valithria Dreamwalker encounter are Level 83 (non-skulled) but they are still affected by taunts cast by Level 80 Army of the Dead ghouls.
