It depends on which 3stars (and their sig levels) u having and your skill to control champs. Well there're plenty of things you should spend your energies on with 3-stars before going to Act 3. Make sure to have Beginner and Normal (and maybe Heroic) modes of event quest done, catalyst daily quest 100%... Act 3 rewards arent that good to look forward to anyways
Act 3 can EASILY be beaten with 3 star champs. When I beat Act 3 about 3 years ago, 4* champs were still hard to come by and 5* champs didn't exist. Resources were scarce. My entire team was 3* champs and none of them were 4/40. My questing team at the time was Gamora, Hawkeye, War Machine, Magneto Marvel Now, and Spider-man. You know...all the top tier champs.
The fights are very straightforward. Just practice parry and dexterity. Once you have those masteries and learn how to use them effectively, you'll walk through Act 3.
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The fights are very straightforward. Just practice parry and dexterity. Once you have those masteries and learn how to use them effectively, you'll walk through Act 3.