now the question is , can u controll the lich king ?
Guys, guys, guys. You can use it on the trash mobs in ICC, have fun
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it probably won't work for faction leaders. i tried taking one to stormwind and he just despawned, they probably don't want you bringing something in and letting it lose after 5 mins to annoy people.
Bosses cant be controlled via this plus the controlled mob will despawn on teleport/zone change, summon etc etc.
I did however have fun controlling one in Dragonblight, flying up around Naxxramas and seeing him stand there, in the air, hitting me once control dropped
I can confirm that you can use Control Undead on those gigantic elite undead on the bridge between Icecrown and Crystalsong (just outside Dalaran). It's so huge that 70% of my screen is just the undead's ass.
I tried queuing for a BG, wait 1 minute after the queue pops, use Control, then queue in. My giant didn't appear in the BG