Is there a way to keep the weapons in Jewels of the North event without paying?

Basically we need to get fire emblem.

It seems that the only way to do so is to kill a boss or to get it from premium something.

I am considering 3 options

1. Find ways to get it free. So which boss should I fight?
2. Buy that premium battle pass. But if I buy will the effect be permanent?
3. Just let it go. Move on and lost my very leveled up

I wonder which one I should choose.

If the effect of premium battle pass is permanent I will just buy.

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