The orbs in the BF are just decorative.
As Kiya said, other than missing some experience and minor loot, I don't think you will run into any problems from bypassing the necromancer's task. It is part of the main plot, but I am pretty sure if you are out of the cave the game assumes it was finished.
If you want to complete this quest but either can't or don't want to reload a save from before teleporting out of the cave, you use a save from before having the alchemist make the cure and
hex edit teleport yourself back in (let me know, and I'll get the coordinates).
act ii - hints for shamanHow do I defeat the Shaman?
