Who should I rank up?

Lj98

I recently got an iPhone and can’t log in through Google anymore, I’m not sure how to find out what the email is on my girlfriends phone so I decided to start again, I’ve just fully explored act 5 and want to start pushing to cavalier. I’m not entirely sure who to rank up though. I’ve got 2 generic 5* gems and 320 stones. I also have a tech gem, but was saving that for the ghost in the calendar tomorrow and I also have a mystic gem


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