more 6* shards how??

What are the possible resources for getting more 6* shards?? please help me to get more

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Featured 5* arena, UC Event Quest. $ on crystals if you are UC or Cavalier

but this month UC event quest(thanos) is too hard to defeat
and my roaster is not as big for playing 5*featured arena??

but this month UC event quest(thanos) is too hard to defeat
and my roaster is not as big for playing 5*featured arena??

Gonna have to wait for next month's EQ, and hope you keep duping 5*s