Endless nightmare

Hi,
The endless nightmare seems undertuned as it is doesn't provide much for running it and can close any moment (bearing in mind that it doesn't proc much, regular or manual way). The main issue would be that even if it would've been used for leveling, it provides good exp only in alluring version, but next portal usually would change type of Vaal zone... If it would have retained type of Vaal zone each time you travel to next zone, or next portal had at least 50% chance to be alluring it won't be such let down...