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P.S. There is no such thing as a stupid question.
Questions and Answers
Q1: Is there a way to get those rainbow crystals that let you get over lvl 80 other than getting repeated characters in the gacha?
A1: Currently, there is no way to gain rainbow crystals other than by getting duplicate characters from the gacha. However, some users are speculating that rainbow crystals by be given out in the future as part of event rewards. This is, of-course, just speculation so take it with a grain of salt.