I asked on global chat if this quest is bugged, but people told me they did it fine in the last weeks.
The moment the fight start, the whole area is covered with Blight Fog which do 1.2k dmg per second, and not avoidable.
How the hell do you solo this quest? This is not a group quest, and if someone else join me, he can't see or attack Drakuru.
It is a phased quest so you can only see others that are on it. The undeads you are able to control don't seem to be working correctly and that part may be a little bugged. Even though you can't see other players on the quest they can still see you, but not drakuru and if you can find a healer they should be able to heal you through it.