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1. Is it better to level your intended sub class first then your main, or the opposite?

2. What's the best way to get 10*+ items from level 50 onward?

3. Does Gu and Ra benefit Fo and Te as a...

I could recommend Vibras Bow, having the second highest T-Atk for a B.Bow, but you said you don't have prem for passes. My best suggestion for Freemium would be Mercy of Lillipa.
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What outfit looks closest to a traditional Jiangshi costume?

How good is Te/Hu?