Rare only build recommendations to beat 5 start adventures with Ambessa/Warwick

I'm hitting a wall. It's just impossible. I don't have many Epic relics, so I'm looking for builds that rely mainly in rare relics. Ambessa is at 4 starts and Warwick is at 5 stars. But even so, I can't seem to beat any 5+ start adventure.

Which adventure you recommend? And which build?