[Mardur]

The Warrens were released on live between Velious and Luclin, so it'll be a very long time before you see that zone here.

Yes, one of the points of the Warrens was to allow a way for evil Erudites to gain faction and escape Odus.

The problem is, things are working exactly like they did in classic (well with the exception that you start in Paineel other than Tox which is irrelevant), and won't be arbitrary changed to be made easier. Luckily necromancers get invis relatively early, but it's a rough road for erudite shadow knights. Always was, and will be here.