Best no nonsense grind xp zones are the ones you don't tell other people about
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There are 3 very, very good ones esp for solo and duo that have not even been mentioned. I did some grouping and duoing with my warrior, but also soloed from 51-55 (getting just as good xp as group or duo). Oh and might I add: no fungi tunic, no fungi staff, non-troll, and buggy bind wound (could only bind to 50%). The bind wound cap and buggy damage tables hampered me from soloing 55-60 though