High lvl Extermination 2 quest!

Ok so with the bot i`m guessing all of you are getting ur paladin rep up very fast as me but i`m having trouble with the quest ... the High lvl Extermination 2 quest when i need to kill the 3 elite mobs of Khar`s ... i killed the first 2 but at the 3rd one, Maze TreeSpirit lvl 65 i`m having very big trouble, i found him twice and both times he dissapeared on me when i was killing him and can`t find him again.
Anybody can give me some adivice or some help cuz it`s really bugging me for 3 days now.
Thx

I have problem with that quest too. As far I know those elite mobs spawn only during Karth's Elite guards invasion. When it occurs there is information on serwer. But I havent been lucky in days and ddint see it. Do you remember at what hour did you kill those mobs?

i think it was about 3pm server time ... can`t be that acurate cuz i didn`t think they are on a program :)
anyway i`m on quest 3 now, didn`t finish the second one

on BOI ph... these mobs respawn at exactly 22:30 in the server time.....