Kaesora. For the 30-40 range, maybe more like 33 depending on class/group. It's very hard to beat kaesora exp. Park your but at the library and you can do this level range at about one level per hour in a fast killing trio. Me and my friends went at 35. Fungi monk, fungi ranger, non twinked warrior, and all left at 41 about 7 hours later.
Bonus, you can go down to the church and hang out till 45 or so easily. And except for those camping xalgoz, the zone is usually empty.
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