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Should I got my armors level 15 too. I'm currently +14, Should I worry?
Don’t worry, +14 will give you 75% of the Aetherhearts of +15 so you will still get most of the rewards.
It will make your class lv20 if you have even 1 15 weapon
If you reach +10 on a weapon then you will get level 20 on that class. Getting higher level gear will give you more Aetherhearts.