The Necro solo, and that Cleric Mage duo can handle LOIO as soon as ~15, and likely stay there as long as the exp lasts til maybe late 20s. That said, never forget the classic spots i.e HK guards in your 20's and 30's.
edit: google search, or forum search for Zone Experience Modifiers in classic/kunark. often with the guide you find it'll list a level range that likely you can hang your hat on.
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