Best way to get Tier 4 Basic Catalyst
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What is best way to get Tier 4 Basic Catalyst? I see the Daily Proving Grounds has expert mode where you can get some fragments but it takes too long to build an actual catalyst required to upgrade my 4 stars and lone 5 star.
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And being in an alliance that runs map 5 x 5 also helps a lot. Tbh I think this is the best way.