What act do I reach to get Corina’s challenges unlocked bc I am in act 6 chapter 1

I just need someone to answer my question it would be nice thx

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Thronebreaker - 6.4.6 grandmaster done aswell as 3 R3s or is it 1? Its been a long time

Thronebreaker - 6.4.6 grandmaster done aswell as 3 R3s or is it 1? Its been a long time

1 r3 and 3 r4 for pargon