After you complete Anya quest (3rd quest I think), Anya will give you an item and open a red portal to Nihlatheks Temple. Enter the portal, move past the corpses in the room, move up the stairs and into the room, Pindleskin is the boss of the pack of undead corpses and he guards the gateway to Nihlatheks domain.
You can't (besides taking the wp and backtracking). Most people don't bother killing Nihlathak (the reward is not worth the risk), so the portal stays up forever. I think, however, that the portal also goes down if you activate the wp in Halls of Pain(?), even if you don't finish the quest
yes, it usually doesnt take long either unless you run into a pack of lords, but when you come up to where pindle is, watch it, if hes aura enchanted with another nasty mod you may find yourself in a bind.
Well got rushed through to that quest from a friend. My 83 sorceress with 428% magic find and 590% gold find is toast too fast and my friend who is a Trapassin(?) gets about 50% of the kills with her pet and traps anyway.
But out of about 20 runs we only got one gold item (Chance Guards Chain Gloves), which I already had.
So will level either a Skellimancer or a Hammerdin and open the portal for them when they get up there.