I'm glad you could get through it with 3 R4 4*s and (2 R3 4*s I'm assuming) signs of a good player :-) But on the other hand this completely proves the point I'm trying to make. The word Master (in regards to difficulty) implies a challenge and for your champs at your level it was.. but their not considering the player with (5 4*s R4/R5/ 5*s R3/R4) as R4GE and @Tiago1980 have said they should introduce new levels of progression and a higher bracket with better rewards
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I second that..tho I cleared dorm a month earlier but skip the mutant (icey, aa and psylocke) one...