I'm not sure if the POD has been messed with at all on them over the years but the Sentry Spiders in the Spider Lair under the meadow north of Nightmist used to be decent exp.. not great but decent enough. There is a spot in the area that exits back into the sewer(you'll be able to see it on the map on the wiki it's at the top left hand side) with a few of them that you can hit and run. It's slower than swamps and all that but it's pretty easy to stay alive and has a quick exit to run for pots/mana when it gets to be that time.. only downside is a couple KTP sentry spiders on the way down there(and a death trap.. also on the map marked with a red arrow be careful!) but it's pretty easy to survive for a while as long as you don't mess around in the areas with lots of spiders on the way too much and waste your inventory of pots getting there.
I'm also unsure if 1a has a different level cap or anything than multi does for this area.