I have been trying a lot and I just cant beat the last encounter of tier 7, breezing through the first 3.
This is my squad: http://swgoh.gg/squads/114583/
I hope you to make Zep's potency at least 50%. He must stun Thrawn with his skills and Ezra & Hera's assist as possible as he can, higher potency will make it easier.
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I want to get CLS the next time around, so getting 7* Thrawn makes it a lot easier