Further examination of these items leads me to believe that you might just have the stats of lower and higher tiers of the same item switched around, especially when higher tiers seem to consistently have lower stats, lower upgrade boosts, and lower upgrade costs.
For farming exp, you'll probably want to set all of your warriors to max speed boost books, and farm the sewers until you can get everybody transparent swords, which aren't to be confused with glass swords.
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