I made sure to log in every 4 hours and saved up over 100 crystals. Don't open them so u dont have to worry about them expiring yet. They will b there when u need them. I didn't use any units. The mastery tree will help your gameplay more than redoing a path or two.
Hey @Neotwism I'm on act 5.2.4 myself and have loads of those free crystals. Can you please guide me on the mastery setup. If you can post a pic of you masteries here, that will be a big help!
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I used like 10 lvl 1 and 2 lvl 2