How to find haunted archbringer blade

[Vordnox]

Hey guys, i have taken down a fair number of zombies in your new instance ( without having a quest, im refering to the one instance that has a haunted sort of house in it ) but havent found the haunted archbringer blade so that i may move on to the next quest. Any help here? 

[mavrathion]

Well in Karazan once you pass those hundreds of zombies you get to the boss, the Haunted Ashbringer has a 5% drop rate from the boss. 
And then you move to Skywall :p

[Vordnox]

Well in Karazan once you pass those hundreds of zombies you get to the boss, the Haunted Ashbringer has a 5% drop rate from the boss. 

And then you move to Skywall :P

well ****, when does the boss respawn?

[mavrathion]

Karazan is a dungeon, meaning you run it, tele out, reset, and rerun :P

[counterwow21]

HOLY LUCK BALLS. I ran this ONCE and got it. I feel lucky as hell now....