I did Ancient Croc from 29 to the mid 30's. It was fun because there are lots of Frogloks nearby to kill while waiting on the Croc spawn, so you get the real dungeon experience. I used the Animated pet however, which has been nerfed since back then, so perhaps you'd need to wait until 34 now for this to work (the Ancient Croc drops are also probably trash now). You also only needed to do 1 point of damage to get full exp while solo with a pet back then
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